Initial commit of mtrack.

This commit introduces mtrack, a multitrack player meant for live performance
use.

.github/workflows/mtrack.yaml

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+name: mtrack
+on: [push, pull_request]
+
+jobs:
+  clippy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Update apt
+      run: sudo apt update
+    - name: Install alsa
+      run: sudo apt-get install -y libasound2-dev
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        components: clippy
+    - uses: Swatinem/rust-cache@v2
+    - name: Run clippy
+      run: cargo clippy --all --all-features
+
+  rustfmt-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Update apt
+      run: sudo apt update
+    - name: Install alsa
+      run: sudo apt-get install -y libasound2-dev
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        components: rustfmt
+    - uses: Swatinem/rust-cache@v2
+    - name: Run rustfmt
+      run: cargo fmt --all -- --check
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Update apt
+      run: sudo apt update
+    - name: Install alsa
+      run: sudo apt-get install -y libasound2-dev
+    - uses: dtolnay/rust-toolchain@stable
+    - uses: Swatinem/rust-cache@v2
+    - name: Test mtrack
+      run: cargo test --all --verbose
+
+  licensure:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@stable
+    - name: Install licensure
+      run: cargo install licensure
+    - name: Check for licenses
+      run: licensure --check -p

.gitignore

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+target
+.vscode

.licensure.yml

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+change_in_place: true
+excludes:
+  - \.gitignore
+  - .*lock
+  - \.git/.*
+  - \.licensure\.yml
+  - README.*
+  - LICENSE.*
+  - .*\.(md|rst|txt)
+  - Cargo.toml
+  - .*\.yaml
+  - .*\.wav
+  - .*\.mid
+licenses:
+  - files: any
+    ident: GPL-3.0
+    authors:
+      - name: Michael Wilson
+        email: mike@mdwn.dev
+    auto_template: true
+
+comments:
+  - columns: 80
+    extensions:
+      - rs
+    commenter:
+      type: line
+      comment_char: "//"
+      trailing_lines: 0