being exported to libgimp, and having a non-exported value, this is a
horrible mess like with GimpLayerMode, but at least the cruft value
names are deprecated now.
C++ won't allow us to use GimpLayerMode in the API where we used to
have GimpLayerModeEffects.
Move GimpLayerModeEffects to libgimpbase/gimpcompatenums.h so it's
not in the API any longer, and instead typedef and define stuff in
libgimp/gimptypes.h, and adapt the compat enum registering code
accordingly.
Which are entirely private (not installed). They contain compat values
for enums where values have been renamed in gimpbaseenums.h. The old
names get the old nicks generated so the new values in gimpbaseenums.h
can have proper new nicks. Register them as compat enums using
mechanism introduced for the GimpLayerMode change.
Michael Natterer