LqrRetVal — the return value of many Liquid Rescale library functions
The return type of many functions in the Liquid Rescale library is LqrRetVal, which is an
enum type that can take these values:
LQR_OKeveryting OK
LQR_ERRORgeneric fatal error
LQR_NOMEMnot enough memory
LQR_USRCANCELaction cancelled by the user
The user should handle the error values explicitly at each function call returning this type.