Improve build system configuration (#121)

Overall, the changes are syntactic cleanups, but there are some
important changes:

- The dependency management is now using CMake `FetchContent` instead of
Git submodules. This was because it integrates better with the build
system and because `FetchContent` was a newer and less familiar feature
when I created the project.
- Updated the toolchain configuration to match Visual Studio's default
settings, particularly for the Release configuration. Previously the
binaries were larger due to CMake defaults missing specific optimization
flags, which resulted in unnecessary padding.
- Configured the build to output artifacts (the DLLs) to the
`${CMAKE_BINARY_DIR}/bin` directory, regardless of the which
configuration is selected in Visual Studio.

Author: wopss

.github/workflows/build.yml

@@ -65,8 +65,8 @@ jobs:
           New-Item -ItemType directory -Path $packagingDir/red4ext/plugins
 
           # Copy the build artifacts.
-          Copy-Item -Path ./${{ matrix.config }}/bin/winmm.dll -Destination $packagingDir/bin/x64
-          Copy-Item -Path ./${{ matrix.config }}/bin/RED4ext.dll -Destination $packagingDir/red4ext
+          Copy-Item -Path ./bin/winmm.dll -Destination $packagingDir/bin/x64
+          Copy-Item -Path ./bin/RED4ext.dll -Destination $packagingDir/red4ext
 
           # Copy the license and third-party licenses.
           Copy-Item -Path ../LICENSE.md -Destination $packagingDir/red4ext/LICENSE.txt
@@ -83,8 +83,8 @@ jobs:
           New-Item -ItemType directory -Path $packagingDir/red4ext
 
           # Copy the PDBs.
-          Copy-Item -Path ./${{ matrix.config }}/bin/winmm.pdb -Destination $packagingDir/bin/x64
-          Copy-Item -Path ./${{ matrix.config }}/bin/RED4ext.pdb -Destination $packagingDir/red4ext
+          Copy-Item -Path ./bin/winmm.pdb -Destination $packagingDir/bin/x64
+          Copy-Item -Path ./bin/RED4ext.pdb -Destination $packagingDir/red4ext
 
       - name: Upload ZIP
         uses: actions/upload-artifact@v4

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
         working-directory: build
         run: |
           cmake `
-            -DRED4EXT_IS_CI_RELEASE=YES `
+            -DRED4EXT_GIT_METADATA=YES `
             ${{ github.workspace }}
 
       - name: Build
@@ -53,8 +53,8 @@ jobs:
           New-Item -ItemType directory -Path $packagingDir/red4ext/plugins
 
           # Copy the build artifacts.
-          Copy-Item -Path ./${{ env.config }}/bin/winmm.dll -Destination $packagingDir/bin/x64
-          Copy-Item -Path ./${{ env.config }}/bin/RED4ext.dll -Destination $packagingDir/red4ext
+          Copy-Item -Path ./bin/winmm.dll -Destination $packagingDir/bin/x64
+          Copy-Item -Path ./bin/RED4ext.dll -Destination $packagingDir/red4ext
 
           # Copy the license and third-party licenses.
           Copy-Item -Path ../LICENSE.md -Destination $packagingDir/red4ext/LICENSE.txt
@@ -74,8 +74,8 @@ jobs:
           New-Item -ItemType directory -Path $packagingDir/red4ext
 
           # Copy the PDBs.
-          Copy-Item -Path ./${{ env.config }}/bin/winmm.pdb -Destination $packagingDir/bin/x64
-          Copy-Item -Path ./${{ env.config }}/bin/RED4ext.pdb -Destination $packagingDir/red4ext
+          Copy-Item -Path ./bin/winmm.pdb -Destination $packagingDir/bin/x64
+          Copy-Item -Path ./bin/RED4ext.pdb -Destination $packagingDir/red4ext
 
           # Create the ZIP file.
           7z a red4ext_${env:RED4EXT_VERSION}_pdbs.zip $packagingDir/*