Temporarily vendor in alacritty for gif creation

It was vendored from https://github.com/myfreeweb/alacritty/tree/alacritty-split-new

with hash:

valpackett/alacritty@3443033

This goes away when the following PR is merged:

alacritty/alacritty#1023

alacritty/.agignore

@@ -0,0 +1 @@
+tests/ref

alacritty/.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,4 @@
+Which operating system does the issue occur on?
+
+If on linux, are you using X11 or Wayland?
+

alacritty/.gitignore

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+target
+FlameGraph
+
+# Temp files
+.idea
+*.iml
+
+# vim temporary files
+*.swp
+
+# other ignores
+*.DS_Store
+=======
+
+# Snapcraft files
+stage
+prime
+parts
+*.snap
+*.pyc
+alacritty_*_source.tar.bz2

alacritty/.travis.yml

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+language: rust
+sudo: false
+
+cache: cargo
+
+os:
+  - linux
+  - osx
+
+rust:
+  - stable
+  - nightly
+
+env:
+  - FEATURES="clippy"
+  - FEATURES=""
+
+matrix:
+  fast_finish: true
+  exclude:
+    - rust: stable
+      env: FEATURES="clippy"
+    - rust: nightly
+      env: FEATURES=""
+  allow_failures:
+    - rust: nightly
+
+script:
+  - cargo test --no-default-features --features "$FEATURES"

alacritty/Alacritty.desktop

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+[Desktop Entry]
+Type=Application
+TryExec=alacritty
+Exec=alacritty
+Icon=utilities-terminal
+Terminal=false
+Categories=System;TerminalEmulator;
+
+Name=Alacritty
+GenericName=Terminal
+Comment=A cross-platform, GPU enhanced terminal emulator
+StartupWMClass=Alacritty
+Actions=New;
+
+[Desktop Action New]
+Name=New Terminal
+Exec=alacritty