Levels for WoG neutral creatures - fixes #1282.

Renamed Myriad and Medusa Queen (sic?) to Arctic & Lava Sharpshooter.

git-svn-id: http://svn.code.sf.net/p/vcmi/code/trunk/@3445 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834