Port of Simon Tatham's Puzzle Collection

Original revision: 5123b1bf68777ffa86e651f178046b26a87cf2d9

MIT Licensed. Some games still crash and others are unplayable due to
issues with controls. Still need a "real" polygon filling algorithm.

Currently builds one plugin per puzzle (about 40 in total, around 100K
each on ARM), but can easily be made to build a single monolithic
overlay (800K or so on ARM).

The following games are at least partially broken for various reasons,
and have been disabled on this commit:

Cube:     failed assertion with "Icosahedron" setting
Keen:     input issues
Mines:    weird stuff happens on target
Palisade: input issues
Solo:     input issues, occasional crash on target
Towers:   input issues
Undead:   input issues
Unequal:  input and drawing issues (concave polys)
Untangle: input issues

Features left to do:
 - In-game help system
 - Figure out the weird bugs

Change-Id: I7c69b6860ab115f973c8d76799502e9bb3d52368

apps/plugins/puzzles/rect.R

@@ -0,0 +1,19 @@
+# -*- makefile -*-
+
+rect     : [X] GTK COMMON rect rect-icon|no-icon
+
+rect     : [G] WINDOWS COMMON rect rect.res|noicon.res
+
+ALL += rect[COMBINED]
+
+!begin am gtk
+GAMES += rect
+!end
+
+!begin >list.c
+    A(rect) \
+!end
+
+!begin >gamedesc.txt
+rect:rect.exe:Rectangles:Rectangles puzzle:Divide the grid into rectangles with areas equal to the numbers.
+!end