Fog of war improvements. Tank crush expansion. Bug fixes

In this update the fog of war now fully hides all changes in unexplored areas. The tank crushing mechanic has been expanded to all heavy tanks. We've fixed a number of bugs, including collision issues with the Ram and internal engine errors. For modders, we've added the Aura system.

General:

- The fog of war now fully conceals all changes in unexplored areas

- Improved language recognition for player names; unrecognized languages now fall back to the Chinese font

Modding:

- Introduced the Aura system: auras can be attached to unit types and provide positive or negative effects on the stats of allied or enemy units within range

Bug Fixes:

- Fixed broken collision on the Ram, which allowed it to move through other units

- Fixed various internal engine errors

Balance:

- All heavy tanks can now crush smaller units

- Fury of Durga: now speeds up all allied wild animals (Tigers) in its vicinity by 40%

- Tiger: movement speed reduced from 100 to 85