Merge remote-tracking branch 'origin/master' into master

.github/workflows/build-ubuntu.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Doryen-Ubuntu
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on: [pull_request]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  Build: 
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      - name: Install SDL Version 1.2.15
+        run: sudo apt install libsdl1.2-dev
+
+      - name: Create the Build Directory
+        run: mkdir Build
+
+      - name: Configure
+        working-directory: ./Build
+        run: cmake .. -D CMAKE_CXX_COMPILER=gcc-9
+
+      - name: Build
+        working-directory: ./Build
+        run: cmake --build . -j 2
+
+      - name: Test
+        working-directory: ./Build
+        run: ctest -j 2