Merged improvements on the CMakeLists.txt script file.

Made along with Nido and tested by Paul.
- Added minimum dependencies version checks for Ogre, CEgui and SFML
by Nido.
- Also fixed the debian packaging requirements.
- Added the necessity to have the thread boost library.
- Improved a bit boost detection when building on Windows.
- Removed obsolete MSVC /statements
- Fixed indentation.
- Made the CMake file usable on Debian CMake.
MEDIA: Merged addition of working media files.

The media/ files are overall only 28.5Mb which is not a sufficient reason IMHO to not track
these here.

- Changed the gitignore file to now keep track of media files changes.

- Added the media files within the dev repository.
- Adding Beetle Golem, Ruin Entrance and Wooden Watch Tower models (OGA conversions)
- Imported latest changes from opendungeons-media.
- CEGUI XML updated to 0.8 format
- Updated XML files for CEGUI 0.8.x
- GLSL scripts : texture(1D\2D\3D\Cube) -> texture
- UnifiedMinArea -> MinArea fixed
- Fixed old set: image: nomenclature in the looknfeel
- Changed type of SGXLib_FetchNormal
- Added New Skorpio Tileset files needed for a full gaming experience.
- Fixed the OpenDungeons GUI imageset offsets for CEGUI 0.8.
- I also added the CEED project files.
- Changed the OpenDungeons to the one of the website.
- Added licenses and credits files
- Added missing licensing info the main menu Gui graphics.
- Added the app windows icon file.

There os no code change are icon on windows should be handled
through resource file.
Unfortunately, resources files are disabled under MSVC 2012 express.

So I only added the icon for a possible future installer and to have
a icon reference anyway.

- Update of the Orc mesh & skeleton by Skorpio.
- Forgot to remove the (a|b) in certain post-fixes models.
- Fixed most of the material files, keeping the link to the general.material file.
- Fixed the Adventurer texture format to be homogenous.
- Fixed the Orc material names with Skorpio's help.
- Fixed the Kobold material name based on Ogre debug log.
- Upgraded the Editor toolbox CEGUI layout to version 4.
- Actually fixed the editor toolbox this time.
- (Re) add the new main menu CEGui files now that conflicts are resolved.
- Reapplied the correct level file now that conflicts are resolved.
TEMP: Disable translations for now.

setLocale() isn't found in my Win7 environment.
Removed the XML/ folder as it is useless anyway.
Several small editor improvements.

- Removed a few dead members in the editor mode
- Removed the dead brush mode as it was replaced by tile dragging
already.
- Added tile coordinates, and tile type information next to the cursor
This way, you know what you are handling or dragging.
- Added a check to prevent adding walls on top of a creature.
- Added a check to prevent dropping a creature on a wall tile.
In that case, the creature will go back to its former position.
Made the music handled by each game mode.

Now each game mode will play the music it wants or stop playing.

This permitted me to play some music in the main menu and
in the game mode but no more in the editor.

NOTE: We need a new music file for in-game use.
Readded Lava support.