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/glew-cmake-2.2.0/.gitignore

@@ -0,0 +1,25 @@
+*.pc
+/src/*.c
+/include/GL/*.h
+/build/vc6/*.rc
+/build/*.rc
+/build/*/*.sdf
+/build/*/*.suo
+/build/*/*.db
+/build/*/*.vcxproj.user
+/build/*/.vs/
+/build/*/tmp/
+/build/cmake/CMakeFiles/
+/build/cmake/CMakeCache.txt
+/build/cmake/cmake_install.cmake
+/build/cmake/Makefile
+/auto/extensions
+/auto/registry
+/bin
+/lib
+/tmp
+/out
+.DS_Store*
+auto/EGL-Registry
+auto/OpenGL-Registry
+auto/glfixes