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_OK
everyting OK
LQR_ERROR
generic fatal error
LQR_NOMEM
not enough memory
The user should handle the error values explicitly at each function call returning this type.