- continuous integration workflow revamp

* use latest virtual machines
* simplify formatting, and remove lots of useless quotes (+1 squashed commit)

.github/workflows/continuous_integration.yml

@@ -10,33 +10,30 @@ jobs:
       fail-fast: false
       matrix:
         config:
-        - {
+        - name: Visual Studio 64-bit
-            name: "Visual Studio 64-bit",
+          os: windows-latest
-            os: windows-2019,
+          extra_options: -A x64
-            extra_options: "-A x64"
+
-          }
+        - name: Visual Studio 32-bit
-        - {
+          os: windows-latest
-            name: "Visual Studio 32-bit",
+          extra_options: -A Win32
-            os: windows-2019,
+
-            extra_options: "-A Win32"
+        - name: macOS
-          }
+          os: macos-latest
-        - {
+
-            name: "macOS",
+        - name: Linux GCC
-            os: macos-10.15
+          os: ubuntu-latest
-          }
+
-        - {
+        - name: Linux Clang
-            name: "Linux GCC",
+          os: ubuntu-latest
-            os: ubuntu-20.04
+          extra_options: -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++
-          }
+
-        - {
+        build_type: 
-            name: "Linux Clang",
+        - Release
-            os: ubuntu-20.04,
+        - Debug
-            extra_options: "-DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++"
-          }
-        build_type: ["Release", "Debug"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Configure
       shell: bash