File I/O Abstraction

☑	Function	libSDL2pp method(s) / Notes
☑	SDL_AllocRW	RWops::RWops(CustomRWops)
☑	SDL_FreeRW	RWops::~RWops()
☑	SDL_RWFromConstMem	RWops::FromConstMem()
☑	SDL_RWFromFP	RWops::FromFPMem()
☑	SDL_RWFromFile	RWops::FromFile()
☑	SDL_RWFromMem	RWops::FromMem()
☑	SDL_RWclose	RWops::Close()
☑	SDL_RWread	RWops::Read()
☑	SDL_RWseek	RWops::Seek()
☑	SDL_RWtell	RWops::Tell()
☑	SDL_RWwrite	RWops::Write()
☑	SDL_ReadBE16	RWops::ReadBE16()
☑	SDL_ReadBE32	RWops::ReadBE32()
☑	SDL_ReadBE64	RWops::ReadBE64()
☑	SDL_ReadLE16	RWops::ReadLE16()
☑	SDL_ReadLE32	RWops::ReadLE32()
☑	SDL_ReadLE64	RWops::ReadLE64()
☑	SDL_WriteBE16	RWops::WriteBE16()
☑	SDL_WriteBE32	RWops::WriteBE32()
☑	SDL_WriteBE64	RWops::WriteBE64()
☑	SDL_WriteLE16	RWops::WriteLE16()
☑	SDL_WriteLE32	RWops::WriteLE32()
☑	SDL_WriteLE64	RWops::WriteLE64()