feat(gx): add incomplete 'CGxDeviceGLSDL' (#2)

* chore(build): add vendored SDL 3.0.0 library

* chore(build): add vendored glew-cmake-2.2.0 library

* feat(console): in the presence of -opengl launch flag, change GxApi to OpenGl

* feat(gx): add uncompleted CGxDeviceGLSDL targeting Windows and Linux

* chore(build): change SDL3 linkage from shared (bad) to to static (good)

vendor/sdl-3.0.0/.github/workflows/haiku.yml

@@ -0,0 +1,57 @@
+name: Build (Haiku)
+
+on: [push, pull_request]
+
+jobs:
+  haiku:
+    runs-on: ubuntu-latest
+    name: Haiku
+    container: haiku/cross-compiler:x86_64-r1beta4
+    steps:
+    - uses: actions/checkout@v3
+    - name: Setup dependencies
+      run: |
+        apt-get install pkg-config -y
+    - name: Configure Haiku environment variables
+      run: |
+        echo "CC=x86_64-unknown-haiku-gcc" >> $GITHUB_ENV
+        echo "CXX=x86_64-unknown-haiku-g++" >> $GITHUB_ENV
+    - name: Configure (CMake)
+      run: |
+        cmake -S . -B build -GNinja \
+          -Wdeprecated -Wdev -Werror \
+          -DSDL_SHARED=ON \
+          -DSDL_STATIC=ON \
+          -DSDL_TESTS=ON \
+          -DSDL_WERROR=ON \
+          -DSDL_INSTALL_TESTS=ON \
+          -DSDL_VENDOR_INFO=Github_Workflow \
+          -DCMAKE_INSTALL_PREFIX=cmake_prefix \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_SYSTEM_NAME=Haiku
+    - name: Build (CMake)
+      run: |
+        cmake --build build/ --config Release --verbose --parallel
+    - name: Install (CMake)
+      run: |
+        echo "SDL3_DIR=$(pwd)/cmake_prefix" >> $GITHUB_ENV
+        cmake --install build/ --config Release
+    - name: Package (CPack)
+      run: |
+        cmake --build build/ --config Release --target package
+    - name: Verify CMake configuration files
+      run: |
+        cmake -S cmake/test -B cmake_config_build -G Ninja \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_PREFIX_PATH=${{ env.SDL3_DIR }} \
+          -DCMAKE_SYSTEM_NAME=Haiku
+        cmake --build ./cmake_config_build --verbose
+    - name: Verify sdl3.pc
+      run: |
+        export PKG_CONFIG_PATH=${{ env.SDL3_DIR }}/lib/pkgconfig
+        cmake/test/test_pkgconfig.sh
+    - uses: actions/upload-artifact@v3
+      with:
+        if-no-files-found: error
+        name: SDL-haiku
+        path: build/dist/SDL3*