Notably, this enables "Group".
This also includes some changes to the Rockbox frontend:
- Removes extraneous underline from Extensive Help text.
- Implements a workaround for an upstream breaking change that removes
the BLITTER_FROMSAVED flag. We depend on this for mouse mode. This
is apparently the only place this flag was ever used. Note that I've
hardcoded an arbitrary negative value for BLITTER_FROMSAVED instead
of -1, for the reason Ben Harris mentioned in his commit removing it
from the upstream source tree.
- Adds an implicit clip() to the game region when drawing a
puzzle. This fixes a bug in Untangle where dragging a point off
screen leads to ugly lines outside the play area.
- Implements "Quick Help" for unfinished plugins (but not "Extensive
Help").
- Documents the need to disable unfinished plugins in resync.sh (weak
symbols on win32).
Change-Id: Ic318a5db4b15acb437a3f951fbc9b7919c6fa652
