Release 0.9.2

A new release for Kriegsspiel - 7 years war. It's the 0.9.2. Changelog contains (major changes only):

• Corrected a memory leaks in animations (I am sorry for everyone whoe experienced it :( ).
• Added light cavalry. They fight dismounted, as dragoons. It may change in the future.
• Added "scout" attribute, that allows a battalion to see ambushed troops. This attribute is, for now, only attributed to light cavalry.
• Added campaign artillery.
• Changed menus

Light cavalry and artillery have been added ... BUUT, not in the campaign. My next release will have some missions to train with them, and (if I work well), something different to look at in battlefields !

I am really sorry for the memory leak, I have checked every other possible leak to forbid the bug to come back. Do not hesitate to tell me everything that goes wrong.