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/.lgtm.yml

@@ -0,0 +1,12 @@
+extraction:
+  cpp:
+    prepare:
+      packages:
+      - "build-essential"
+      - "libxmu-dev"
+      - "libxi-dev"
+      - "libgl-dev"
+    index:
+      build_command:
+        - "cd auto; make all -j8; cd .."
+        - "make all -j8"