Add support for DrawFlat=yes in OverlayTypes, tweak rendering paramet…

…ers for higher accuracy in depth rendering

Add "Repeat Last Connected Tile" keyboard command and menu option

Write HouseType indexes starting from 0 also in RA2YR mode

Add extra depth for DTA resource spreaders

Move recent files panel to top of main menu

Make cursor height preview dashed

Fix bug where buildings that had no main shape were not rendered at all

Add label telling which infantry's properties the user is editing

Fix depth rendering issues

Fix vehicles overlapping their own turrets and barrels
Fix buildings overlapping their own animations and turrets
Make it less likely for vehicles to show up behind trees

Optimize shaders on compilation