This enables two of the "unfinished" puzzles. Slide requires a new "sticky
mouse mode" to enable dragging. The help system is disabled for these
puzzles, since they lack manual chapters.
Group is currently unplayable due to lack of request_keys() support, which
will need to be added upstream. Separate fails to draw anything.
Change-Id: I7bcff3679ac5b10b0f39c5eaa19a36b4b1fe8d53
This brings puzzles up-to-date with upstream revision
2d333750272c3967cfd5cd3677572cddeaad5932, though certain changes made
by me, including cursor-only Untangle and some compilation fixes
remain. Upstream code has been moved to its separate subdirectory and
future syncs can be done by simply copying over the new sources.
Change-Id: Ia6506ca5f78c3627165ea6791d38db414ace0804
