Use GHA, bors and add CODEOWNERS from master branch

Author: eldruin

.github/CODEOWNERS

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+* @rust-embedded/hal

.github/bors.toml

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+block_labels = ["needs-decision"]
+delete_merged_branches = true
+required_approvals = 1
+status = [
+  "ci-linux (stable, x86_64-unknown-linux-gnu)",
+  "ci-linux (1.35.0, x86_64-unknown-linux-gnu)",
+]

.github/workflows/ci.yml

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+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Continuous integration
+
+env:
+  RUSTFLAGS: '-D warnings'
+
+jobs:
+  ci-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        # All generated code should be running on stable now
+        rust: [stable]
+
+        # The default target we're compiling on and for
+        TARGET: [x86_64-unknown-linux-gnu]
+
+        include:
+          # Test MSRV
+          - rust: 1.35.0
+            TARGET: x86_64-unknown-linux-gnu
+
+          # Test nightly but don't fail
+          - rust: nightly
+            experimental: true
+            TARGET: x86_64-unknown-linux-gnu
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.TARGET }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --target=${{ matrix.TARGET }}
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --target=${{ matrix.TARGET }}

.github/workflows/clippy.yml

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+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Clippy check
+
+env:
+  RUSTFLAGS: '-D warnings'
+
+jobs:
+  clippy_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: clippy
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/rustfmt.yml

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+on:
+  push:
+    branches: [ staging, trying, master ]
+  pull_request:
+
+name: Code formatting check
+
+jobs:
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check