added xrick game

original xrick code by 'BigOrno' at:
http://www.bigorno.net/xrick/

Rockbox port, plus bugfixes at:
https://github.com/pierluigi-vicinanza/xrick

Further changes:

 * Additonal fixes from g#3026
 * Port to modern plugin API
 * Add Pluginlib keymap fallback
 * Support all >1bpp screens
 * Fix build warnings in miniz
 * Better error message when resources are missing

Change-Id: Id83928bc2539901b0221692f65cbca41389c58e7

apps/plugins/xrick/data/sprites.c

@@ -0,0 +1,22 @@
+/*
+ * xrick/data/sprites.c
+ *
+ * Copyright (C) 2008-2014 Pierluigi Vicinanza. All rights reserved.
+ *
+ * The use and distribution terms for this software are contained in the file
+ * named README, which can be found in the root of this distribution. By
+ * using this software in any fashion, you are agreeing to be bound by the
+ * terms of this license.
+ *
+ * You must not remove this notice, or any other, from this software.
+ */
+
+#include "xrick/data/sprites.h"
+
+/*
+ * globals
+ */
+size_t sprites_nbr_sprites = 0;
+sprite_t *sprites_data = NULL;
+
+/* eof */