GitHub Actions: run clippy, fmt; remove other CI (#365)

Consolidates the multitude of CI systems, replacing Azure, SourceHut, and
AppVeyor with GitHub Actions, which now also runs clippy and fmt. See #352 

* Add task to run clippy

* Add task to check formatting

* Test on 1.44.1 toolchain

* Update readme: status badge and downloads on GitHub Actions

* Remove strip binary task, leave it unstripped to allow debugging for now

* Rename task to install dependencies

* Remove Azure Pipelines

* Remove sr.ht SourceHut CI

* Remove AppVeyor

.github/workflows/build.yaml

@@ -17,9 +17,10 @@ jobs:
       - name: Install Rust
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.44.1
+          components: clippy, rustfmt
           default: true
-      - name: (Linux) Install libxcb-composite
+      - name: Install dependencies
         if: matrix.os == 'ubuntu-latest'
         run: |
           sudo apt-get update
@@ -29,9 +30,13 @@ jobs:
           cargo build --verbose --release
         env:
           MACOSX_DEPLOYMENT_TARGET: 10.14
-      - name: (Linux/MacOS) Strip binary
-        if: matrix.os != 'windows-latest'
-        run: strip target/release/stevenarella
+      - name: Run clippy
+        uses: actions-rs/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-targets -- -D warnings
+      - name: Check formatting
+        run: cargo fmt --all -- --check
       - name: Move binary
         run: |
           if [[ ${{ matrix.os }} == windows ]]; then

README.md

@@ -1,5 +1,5 @@
 # Stevenarella
-[![builds.sr.ht status](https://builds.sr.ht/~iceiix/stevenarella.svg)](https://builds.sr.ht/~iceiix/stevenarella?)
+[![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Ficeiix%2Fstevenarella%2Fbadge%3Fref%3Dmaster&style=plastic)](https://actions-badge.atrox.dev/iceiix/stevenarella/goto?ref=master)
 
 Multi-protocol Minecraft-compatible client written in Rust
 
@@ -56,8 +56,9 @@ Support for older protocols will _not_ be dropped as newer protocols are added.
 
 ## Downloads
 
-Windows users can download pre-compiled builds from here: https://ci.appveyor.com/project/iceiix/stevenarella
-(Select your platform, Click the artifacts tab and download Steven.zip)
+Windows, Ubuntu Linux, and macOS users can download pre-compiled builds
+from [GitHub Actions](https://actions-badge.atrox.dev/iceiix/stevenarella/goto?ref=master).
+(Click the artifacts drop-down and select your platform.)
 
 ## Building