Update #11 (build 61)

Hi guys.

This update is huge, but don't get too excited - it's much more on the back-end than on the front-end. Massive work was done to the game code:

• Game graphics engine were rewritten, textures batching is now used to lower GPU usage;
• Compiled with SDL2/mixer libs, thus 3rd-party modules dependency is avoided and the size of other used libs is reduced;
• Appended OpenGLES2 (mobile devices/Android) renderer for textures batching mode.

After that, of course, fixes and new textures:

• Fixed a crash while displaying routes on the global map;
• Fixed Library/Academy construction process;
• Fixed soundtrack playback on Linux;
• Fixed rendering of tiles, which are placed on the edges of the map;
• Fixed a crash during a briefing between missions, when there is no available missions to continue;
• Fixed special orders window for barn/warehouse, free space is now used properly;
• Fixed city services initialization at the start of every mission, all services start with the correct parameters;
• Fixed buildings settings reading for C3 resouces;
• Fixed audio settings saving when there is no (not defined) audio output device;
• Now you see a placeholder while trying to play a missing video;

• Forum is now available for construction in missions;
• Added German localization for training missions;
• Added Library textures;
• Added Iron mines textures and animations;
• Added Cattle-breeding farm textures.

This update was needed a lot because now mobile gameplay will be much smoother and less resource consuming. New updates to come soon, we have a lot of nice stuff for you. :)