New VA108xx Rust workspace structure + dependency updates

- The workspace is now a monorepo without submodules. The HAL, PAC and BSP
  are integrated directly
- Update all dependencies: embedded-hal v1 and RTIC v2

va108xx-hal/.github/bors.toml

@@ -0,0 +1,2 @@
+status = ["ci"]
+delete_merged_branches = true

va108xx-hal/.github/workflows/changelog.yml

@@ -0,0 +1,20 @@
+on:
+  pull_request_target:
+
+name: Changelog check
+
+jobs:
+  changelog:
+    name: Changelog check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Changelog updated
+        uses: Zomzog/changelog-checker@v1.2.0
+        with:
+          fileName: CHANGELOG.md
+          noChangelogLabel: no changelog
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

va108xx-hal/.github/workflows/ci.yml

@@ -0,0 +1,65 @@
+on: [push]
+
+name: ci
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          target: thumbv6m-none-eabi
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --examples
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          target: thumbv6m-none-eabi
+          override: true
+      - run: rustup component add clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+  ci:
+      if: ${{ success() }}
+      # all new jobs must be added to this list
+      needs: [check, fmt, clippy]
+      runs-on: ubuntu-latest
+      steps:
+        - name: CI succeeded
+          run: exit 0