Alpha 5 patch 9 hotfix 49

Added/changed:

• Optimized info overlays rendering

• Added status "Resources are on the way" for construction

Fixed:

• Workers overlay didn't show teachers

• Minor UI corrections

• Crash on load in some cases

• Mysterious symbols on number inputs

• Construction workers were a bit too chaotic

• Fallow field could be still plown from last year in spring

• Cartwrights could steal horses from saltworks