LibGL+LibSoftGPU: Move rendering related code to LibSoftGPU library

This introduces a new library, LibSoftGPU, that incorporates all
rendering related features that formerly resided within LibGL itself.

Going forward we will make both libraries completely independent from
each other allowing LibGL to load different, possibly accelerated,
rendering backends.

Userland/Libraries/LibGL/SoftwareGLContext.cpp

@@ -5,9 +5,6 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include "SoftwareGLContext.h"
-#include "GLStruct.h"
-#include "SoftwareRasterizer.h"
 #include <AK/Assertions.h>
 #include <AK/Debug.h>
 #include <AK/Format.h>
@@ -15,9 +12,12 @@
 #include <AK/TemporaryChange.h>
 #include <AK/Variant.h>
 #include <AK/Vector.h>
+#include <LibGL/GLStruct.h>
+#include <LibGL/SoftwareGLContext.h>
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/Painter.h>
 #include <LibGfx/Vector4.h>
+#include <LibSoftGPU/SoftwareRasterizer.h>
 
 using AK::dbgln;