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/keen.R

@@ -0,0 +1,25 @@
+# -*- makefile -*-
+
+KEEN_LATIN_EXTRA = tree234 maxflow dsf
+KEEN_EXTRA = latin KEEN_LATIN_EXTRA
+
+keen    : [X] GTK COMMON keen KEEN_EXTRA keen-icon|no-icon
+
+keen    : [G] WINDOWS COMMON keen KEEN_EXTRA keen.res|noicon.res
+
+keensolver : [U] keen[STANDALONE_SOLVER] latin[STANDALONE_SOLVER] KEEN_LATIN_EXTRA STANDALONE
+keensolver : [C] keen[STANDALONE_SOLVER] latin[STANDALONE_SOLVER] KEEN_LATIN_EXTRA STANDALONE
+
+ALL += keen[COMBINED] KEEN_EXTRA
+
+!begin am gtk
+GAMES += keen
+!end
+
+!begin >list.c
+    A(keen) \
+!end
+
+!begin >gamedesc.txt
+keen:keen.exe:Keen:Arithmetic Latin square puzzle:Complete the latin square in accordance with the arithmetic clues.
+!end