Registers all the internal formats. \n
* It is automatically called internally when a format is accessed,
* but can be called to force the internal formats to be registered before other formats.
* Notice that additional formats when registered will be registered before the internal formats
* if imFormatRegisterInternal is not called yet. \n
* To control the register order is useful when two format drivers handle the same format.
* The first registered format will always be used first.
* \ingroup format
Registers all the internal formats. \n * It is automatically called internally when a format is accessed, * but can be called to force the internal formats to be registered before other formats. * Notice that additional formats when registered will be registered before the internal formats * if imFormatRegisterInternal is not called yet. \n * To control the register order is useful when two format drivers handle the same format. * The first registered format will always be used first. * \ingroup format