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)

src/gx/glsdl/GLObject.cpp

@@ -0,0 +1,22 @@
+#include "gx/glsdl/GLObject.hpp"
+#include <bc/Debug.hpp>
+
+void GLObject::AddRefTwin() {
+}
+
+uint32_t GLObject::Release() {
+    BLIZZARD_ASSERT(this->m_RefCount > 0);
+
+    this->m_RefCount--;
+
+    if (this->m_RefCount == 0) {
+        this->ReleaseObject();
+    }
+
+    this->ReleaseTwin();
+
+    return this->m_RefCount;
+}
+
+void GLObject::ReleaseTwin() {
+}