Moving GL backend to new shader translator.

This seems to make a lot of things better, but may also break things.
Cleanup to follow.

src/xenia/gpu/glsl_shader_translator.h

@@ -30,6 +30,8 @@ class GlslShaderTranslator : public ShaderTranslator {
   ~GlslShaderTranslator() override;
 
  protected:
+  void Reset() override;
+
   void EmitTranslationError(const char* message) override;
   void EmitUnimplementedTranslationError() override;