Removed unused methods

Removed unused methods

Note: I left some unused methods just in case:
Input.cpp::CharToKey
Quaternions.cpp::Quat_Mult
Quaternions.cpp::To_Quat
Quaternions.cpp::Quat_2_Matrix
Quaternions.cpp::Quat_2_AA
Quaternions.cpp::Quat2Vector
Models.cpp::loadraw
Models.cpp::Translate
Sprite.cpp::clearTextures
GameTick.cpp::getEndX
GameTick.cpp::getEndY
pack.c::packf
pack.c::spackf
unpack.c::sunpackf
unpack.c::unpackf