OpenGL renderer:

- Improved Vertex & Fragment Shader Decompilers.
- Implemented fp uniform loader.
- Implemented DXT1 & DXT2 textures decompression.
- Implemented draft cellResc module.
- Updated glext.

PPU Interpreter:
- Fixed VSPLTW, VNMSUBFP, VMRGLW, VMRGLH, VMRGLB, VMRGHW, VMRGHH, VMRGHB instructions.

cellFs:
- Fixed cellFsStat syscall.

rpcs3/Emu/GS/GSManager.cpp

@@ -8,7 +8,7 @@ BEGIN_EVENT_TABLE(GSFrame, wxFrame)
 	EVT_SIZE(GSFrame::OnSize)
 END_EVENT_TABLE()
 
-GSManager::GSManager() : m_render(NULL)
+GSManager::GSManager() : m_render(nullptr)
 {
 }