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/README.md

@@ -0,0 +1,88 @@
+xrick
+=====
+
+xrick is a clone of [Rick Dangerous](http://en.wikipedia.org/wiki/Rick_Dangerous),
+known to run on Linux, Windows, BeOs, Amiga, QNX, all sorts of gaming consoles...
+
+License agreement & legal bable
+-------------------------------
+
+* Copyright (C) 1998-2002 BigOrno (bigorno@bigorno.net) (http://www.bigorno.net/xrick/)
+* Copyright (C) 2008-2014 Pierluigi Vicinanza (pierluigi DOT vicinanza AT gmail.com)
+
+I (BigOrno) have written the initial [xrick](http://www.bigorno.net/xrick/) code.
+However, graphics and maps and sounds are by the authors of the original Rick Dangerous
+game, and "Rick Dangerous" remains a trademark of its owner(s) -- maybe
+Core Design (who wrote the game) or FireBird (who published it).
+As of today, I have not been successful at contacting Core Design.
+
+This makes it a bit difficult to formally release the whole code,
+including data for graphics and maps and sounds, under the terms of
+licences such as the GNU General Public Licence. So the code is
+released "in the spirit" of the GNU GPL. Whatever that means.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.
+
+Building
+--------
+
+**Requirements:**
+
+* [CMake](http://www.cmake.org/)
+* [SDL](https://www.libsdl.org/download-1.2.php) version 1.2.x
+* [zlib](http://www.zlib.net/)
+
+1. *Create a build directory*
+
+  ```
+  $ cd xrick-x.x.x
+  $ mkdir build
+  $ cd build
+  ```
+
+2. *Generate your Makefile*
+
+  `$ cmake ../source/xrick/projects/cmake`
+
+3. *Build*
+
+  `$ make`
+
+4. *Install (optional)*
+
+  `$ make install`
+
+Platform specific notes can be found in README.platforms.
+
+Usage
+-----
+
+`xrick --help` will tell you all about command-line options.
+
+Controls
+--------
+
+- left, right, up (jump) or down (crawl): arrow keys or Z, X, O and K.
+- fire: SPACE, end: E, pause: P, exit: ESC.
+- use left, right, up, down + fire to poke something with your stick,
+  lay a stick of dynamite, or fire a bullet.
+- toggle fullscreen: F1 ; zoom in/out: F2, F3.
+- mute: F4 ; volume up/down: F5, F6.
+- cheat modes, "trainer": F7 ; "never die": F8 ; "expose": F9.
+
+More details at http://www.bigorno.net/xrick/
+
+Release History
+---------------
+
+Please see the file called CHANGELOG.md.
+
+Contacts
+--------
+
+Report problems or ask questions to:
+
+* _BigOrno_ (bigorno@bigorno.net)
+* _Pierluigi Vicinanza_ (pierluigi DOT vicinanza AT gmail.com)