display: allow full access to all 4 of each aux buffer category
display: allow full access to all 4 of each aux buffer category

I think there was some confusion about how set_aux_rgba (and friends) worked; it seems the original intent was to toggle each individual buffer whereas it is actually interpreted as a count of how many of these buffers should be enabled.  We should try to clarify the API and/or replace it with something better as soon as possible.

chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d,chandler14362/panda3d