Implemented most of the 0xF opcodes and improved opcode failure
detection
Implemented opcode 0xFx29
Implmented opcode Fx33 and changed iReg from char to short.
Started implementation of Screen class and added RenderTest::ClearScreen
Implemented test RenderTest::SetPixel
Implemented test RenderTest::GetRow
Implemented RenderTest::SetRow
Fixed builtin sprite loading and did half of opcode 6xyn
Implemented Chip8Test::opcode_Dxyn_wrapHorizontal
Chip8Test::opcode_Dxyn_wrapVertical Implemented and 0xD opcode complete