Cleanup interfaces (JabRef#4553)

.circleci/config.yml

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+version: 2
+
+jobs:
+  downloadinstall4j:
+    docker:
+      - image: circleci/openjdk:8-jdk
+    steps:
+      - checkout
+      - run: git submodule sync
+      - run: git submodule update --init
+      - restore_cache:
+          keys:
+            - install4j-{{ checksum "scripts/extract-install4j.sh" }}
+      - run: scripts/download-install4j-and-jres.sh
+      - save_cache:
+          key: install4j-{{ checksum "scripts/extract-install4j.sh" }}
+          paths:
+            - "~/downloads"
+            - "~/.install4j7"
+    filters:
+      tags:
+        only: /.*/
+
+  buildDev:
+    docker:
+      - image: circleci/openjdk:8-jdk
+    steps:
+      - restore_cache:
+          key: dependency-cache
+      - checkout
+      - run: git submodule sync
+      - run: git submodule update --init
+      - restore_cache:
+          key: install4j-{{ checksum "scripts/extract-install4j.sh" }}
+      - run: scripts/extract-install4j.sh
+      - run: install4j7/bin/install4jc --verbose --license=$INSTALL4J_KEY
+      - run: ./gradlew -Pdev=true -Pinstall4jDir="install4j7" release --stacktrace
+      - save_cache:
+          key: dependency-cache
+          paths:
+            - "~/.gradle"
+      - store_artifacts:
+          path: build/releases
+          destination: build
+      - run: scripts/upload-to-builds.jabref.org.sh
+
+  buildRelease:
+    docker:
+      - image: circleci/openjdk:8-jdk
+    steps:
+      - restore_cache:
+          key: dependency-cache
+      - checkout
+      - run: git submodule sync
+      - run: git submodule update --init
+      - restore_cache:
+          key: install4j-{{ checksum "scripts/extract-install4j.sh" }}
+      - run: scripts/extract-install4j.sh
+      - run: install4j7/bin/install4jc --verbose --license=$INSTALL4J_KEY
+      - run: ./gradlew -Pinstall4jDir="install4j7" release --stacktrace
+      - store_artifacts:
+          path: build/releases
+          destination: release
+      - run: scripts/upload-to-builds.jabref.org.sh
+    filters:
+      tags:
+        only: /.*/
+
+workflows:
+  version: 2
+  build:
+    jobs:
+      - downloadinstall4j
+      - buildDev:
+          requires:
+            - downloadinstall4j
+      - buildRelease:
+          requires:
+            - downloadinstall4j
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: /.*/
+

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.gitattributes

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+# unix  line endings at unix files
+gradlew text eol=lf
+*.sh text eol=lf
+*.bat text eol=crlf
+
+AUTHORS text eol=lf
+
+# ensure that line endings of *.java and *.properties are normalized
+*.properties text
+*.java text
+
+# disable after a release
+# CHANGELOG.md merge=union

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+<!-- 
+Note: Please use the GitHub issue tracker only for bug reports. 
+Feature requests, questions and general feedback is now handled at http://discourse.jabref.org.
+Thanks! 
+--> 
+
+JabRef version <!-- version as shown in the about box --> on <!-- Windows 10|Ubuntu 14.04|Mac OS X 10.8|... -->
+
+<!-- IMPORTANT NOTE ->
+<!-- 
+      Please always test if the bug is still reproducible in the latest development version.
+      We are constantly improving JabRef and some bugs may already be fixed.
+      You can download the development version at: http://builds.jabref.org/master/
+      Please make a backup of your library before you try out this version.
+      If you already use a development version, ensure that you use the latest one.
+ -->
+- [ ] I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists
+
+<!-- Add a clear and concise description of what the bug is. -->
+
+Steps to reproduce the behavior:
+1. ...
+2. ...
+3. ...
+
+<!-- If applicable, add excerpt of the bibliography file, screenshot, and excerpt of log (available in the error console) -->
+
+<details>
+  <summary>Log File</summary>
+
+  ```
+  Paste an excerpt of your log file here
+  ```
+</details>

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+Please use the GitHub issue tracker only for bug reports and suggestions for improvements.
+Feature requests, questions and general feedback is now handled at http://discourse.jabref.org.
+Thanks!

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question about JabRef
+
+---
+
+Please use the GitHub issue tracker only for bug reports and suggestions for improvements.
+Feature requests, questions and general feedback is now handled at http://discourse.jabref.org.
+Thanks!

.github/ISSUE_TEMPLATE/suggestion-for-improvement.md

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+---
+name: Suggestion for improvement
+about: Suggest an enhancement
+
+---
+
+<!--
+Please use the GitHub issue tracker only for bug reports and smaller suggestions for improvements.
+Requests for completely new features, questions and general feedback is now handled at http://discourse.jabref.org.
+Thanks!
+-->
+
+**Is your suggestion for improvement related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- describe the changes you have made here: what, why, ... 
+     Link issues by using the following pattern: [#333](https://github.com/JabRef/jabref/issues/333) or [koppor#49](https://github.com/koppor/jabref/issues/47).
+     The title of the PR must not reference an issue, because GitHub does not support autolinking there. -->
+
+
+----
+
+- [ ] Change in CHANGELOG.md described
+- [ ] Tests created for changes
+- [ ] Manually tested changed features in running JabRef
+- [ ] Screenshots added in PR description (for bigger UI changes)
+- [ ] Ensured that [the git commit message is a good one](https://github.com/joelparkerhenderson/git_commit_message)
+- [ ] Check documentation status (Issue created for outdated help page at [help.jabref.org](https://github.com/JabRef/help.jabref.org/issues)?)