Reorganise for UPM with semantic versioning

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: CI
+on:
+  push:
+    branches:
+    - master
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+
+
+    - name: Semantic Release
+      id: semantic
+      uses: cycjimmy/semantic-release-action@v2.1.3
+      with:
+        extra_plugins: |
+          @semantic-release/changelog
+          @semantic-release/git
+        branch: master
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+
+    - name: Create UPM branch
+      run: |
+        git branch -d upm &> /dev/null || echo upm branch not found
+        git subtree split -P "$PKG_ROOT" -b upm
+        git checkout upm
+        if [[ -d "Samples" ]]; then
+          git mv Samples Samples~
+          rm -f Samples.meta
+          git config --global user.name 'github-bot'
+          git config --global user.email 'github-bot@users.noreply.github.com'
+          git commit -am "fix: Samples => Samples~"
+        fi
+        git push -f -u origin upm
+      env:
+        PKG_ROOT: "Assets/ThisOtherThing.UIShapesKit"
+
+
+    - name: Create upm git tag
+      if: steps.semantic.outputs.new_release_published == 'true'
+      run: |
+        git tag $TAG upm
+        git push origin --tags
+      env:
+        TAG: upm/v${{ steps.semantic.outputs.new_release_version }}

.releaserc.json

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+{
+  "tagFormat": "v${version}",
+  "plugins": [
+    ["@semantic-release/commit-analyzer", { "preset": "angular" }],
+    "@semantic-release/release-notes-generator",
+    ["@semantic-release/changelog", { 
+      "preset": "angular",
+      "changelogFile":"Assets/ThisOtherThing.UIShapesKit/CHANGELOG.md"
+    }],
+    ["@semantic-release/npm", { 
+      "npmPublish": false,
+      "pkgRoot":"Assets/ThisOtherThing.UIShapesKit/"
+    }],
+    ["@semantic-release/git", {
+      "assets": ["Assets/ThisOtherThing.UIShapesKit/package.json", "Assets/ThisOtherThing.UIShapesKit/CHANGELOG.md"],
+      "message": "chore(release): ${nextRelease.version} [skip ci]\n\n${nextRelease.notes}"
+    }],
+    "@semantic-release/github"
+  ]
+}