feat: add Motif Storyboard composition plugin

.github/workflows/check.yml

@@ -0,0 +1,38 @@
+name: Check and build
+on: [push, pull_request, workflow_dispatch]
+permissions:
+  contents: read
+jobs:
+  core:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - run: cargo fmt --all --check
+      - run: cargo test --workspace --locked
+      - run: cargo clippy --workspace --all-targets --locked -- -D warnings
+  plugin:
+    strategy:
+      matrix:
+        os: [windows-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Linux GUI and audio headers
+        if: runner.os == 'Linux'
+        run: sudo apt-get update && sudo apt-get install -y libasound2-dev libjack-jackd2-dev libgl1-mesa-dev libx11-dev libxcursor-dev libx11-xcb-dev libxcb1-dev libxcb-dri2-0-dev libxcb-icccm4-dev libxkbcommon-x11-dev
+      - run: cargo fmt --manifest-path plugins/motif-storyboard/Cargo.toml --check
+      - run: cargo test --manifest-path plugins/motif-storyboard/Cargo.toml --locked
+      - name: Windows CLAP
+        if: runner.os == 'Windows'
+        run: python scripts/build-plugin.py
+      - name: Linux CLAP and standalone
+        if: runner.os == 'Linux'
+        run: python3 scripts/build-plugin.py --standalone
+      - uses: actions/upload-artifact@v4
+        with:
+          name: motif-storyboard-${{ runner.os }}
+          path: dist/