Initial package extension of Lean Touch, to get the touched screen areas

TODO: Fix the example Scene with missing assets from Lean Touch package

.github/workflows/main.yml

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+name: Unity Package CI
+on:
+  push:
+    branches:
+    - master
+env:
+    PKG_ROOT: Packages/com.lean.touch.extensions.screenareas
+    PKG_BRANCH: upm
+jobs:
+  split-upm:
+    name: Split upm branch (force)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: split upm branch
+      run: |
+        git subtree split -P "$PKG_ROOT" -b "$PKG_BRANCH"
+    - name: create samples~ folder
+      run: |
+        git checkout "$PKG_BRANCH"
+        if [[ -d "Samples" ]]; then
+          git mv Samples Samples~
+          rm -f Samples.meta
+          git config --global user.name 'github-bot'
+          git config --global user.email '[email protected]'
+          git commit -am "fix: Samples => Samples~"
+        fi
+        git push -f -u origin "$PKG_BRANCH"

.gitignore

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+# This .gitignore file should be placed at the root of your Unity project directory
+#
+# Get latest from https://github.com/github/gitignore/blob/master/Unity.gitignore
+#
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/[Ll]ogs/
+/[Uu]ser[Ss]ettings/
+
+# MemoryCaptures can get excessive in size.
+# They also could contain extremely sensitive data
+/[Mm]emoryCaptures/
+
+# Asset meta data should only be ignored when the corresponding asset is also ignored
+!/[Aa]ssets/**/*.meta
+
+# Uncomment this line if you wish to ignore the asset store tools plugin
+# /[Aa]ssets/AssetStoreTools*
+
+# Autogenerated Jetbrains Rider plugin
+/[Aa]ssets/Plugins/Editor/JetBrains*
+
+# Visual Studio cache directory
+.vs/
+
+# Gradle cache directory
+.gradle/
+
+# Autogenerated VS/MD/Consulo solution and project files
+ExportedObj/
+.consulo/
+*.csproj
+*.unityproj
+*.sln
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
+*.svd
+*.pdb
+*.mdb
+*.opendb
+*.VC.db
+
+# Unity3D generated meta files
+*.pidb.meta
+*.pdb.meta
+*.mdb.meta
+
+# Unity3D generated file on crash reports
+sysinfo.txt
+
+# Builds
+*.apk
+*.unitypackage
+
+# Crashlytics generated file
+crashlytics-build.properties
+
+# Packed Addressables
+/[Aa]ssets/[Aa]ddressable[Aa]ssets[Dd]ata/*/*.bin*
+
+# Temporary auto-generated Android Assets
+/[Aa]ssets/[Ss]treamingAssets/aa.meta
+/[Aa]ssets/[Ss]treamingAssets/aa/*

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