Change log 0.6.5.1

Improvements
- Added setting to enable or disable smart unit selection: when enabled civilian units are culled from selection box if any military units are overlapping selection box

Bug fixes
- While creating selection box and holding shift, the game will no longer add units that are already selected twice
- Fixed a problem with culling civilian units when smart selection was enabled that meant that maximum selected units was not selected even though selection box overlapped with them all
- Correct team color on village improvement buttons in village improvements tree