CHANGE: Bridges follow the same rules as elevated ways about the maximum permissible level of buildings beneath them.
FIX: Bridge weight limits would be ignored in some cases.
Merge branch '11.x' into devel-new
Merge branch 'devel-new' into passenger-generation

Conflicts:
	Simutrans-Experimental.vcxproj
	Simutrans-Experimental.vcxproj.filters
CHANGE: Significantly improve loading time on larger maps.