Adjusted classes visibility
Created project with basic tests
Added time tests
Fixed docs
Merged LocalTime and GameTime
Added Seconds helper class
Adjusted code to the changes
Merge branch 'tests' into develop

Conflicts:
	Plevian/GameTime.cs
	Plevian/LocalTime.cs
Adjusted tests to new Time system
Merge remote-tracking branch 'origin/develop' into feature/Unit_building_feature