Fix exit code of --help and --version, and test them in CI

Corrects prior regression which caused ERROR output and exit code of 1.

.github/workflows/linux_builds.yml

@@ -127,6 +127,8 @@ jobs:
       - name: Unit tests
         if: ${{ matrix.tests }}
         run: |
+          ${{ matrix.bin }} --version
+          ${{ matrix.bin }} --help
           ${{ matrix.bin }} --test --headless
 
       # Check class reference

.github/workflows/macos_builds.yml

@@ -58,6 +58,8 @@ jobs:
       - name: Unit tests
         if: ${{ matrix.tests }}
         run: |
+          ${{ matrix.bin }} --version
+          ${{ matrix.bin }} --help
           ${{ matrix.bin }} --test
 
       - name: Prepare artifact

.github/workflows/windows_builds.yml

@@ -64,6 +64,8 @@ jobs:
       - name: Unit tests
         if: ${{ matrix.tests }}
         run: |
+          ${{ matrix.bin }} --version
+          ${{ matrix.bin }} --help
           ${{ matrix.bin }} --test
 
       - name: Prepare artifact