- moved a large portion of gl_textures.cpp into the main files for the implementing classes.

The old organization made sense when ZDoom still was a thing but now it'd be better if all pure data with no dependence on renderer implementation details was moved out.
A separation between GL2 and GL3+4 renderers looks to be inevitable and the more data is out of the renderer when that happens, the better.

src/r_utility.cpp

@@ -404,13 +404,8 @@ void R_Init ()
 	atterm (R_Shutdown);
 
 	StartScreen->Progress();
-	// Colormap init moved back to InitPalette()
-	//R_InitColormaps ();
-	//StartScreen->Progress();
-
 	R_InitTranslationTables ();
 	R_SetViewSize (screenblocks);
-	Renderer->Init();
 }
 
 //==========================================================================