-Added test subfolder and updated CMakeLists for unit testing - Added a test case for the DrawTerrainOperation class(does not pass all tests successfully, 6 failures left to fix) - Fixed a few bugs

git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3348 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834