* removed vil_small_street - it's now part of the village rma
* fixed +tower loading wrong map (bug #5348 & bug #5354)
* moved the main tile of +tower map to +urban map theme

* removed the other components of the map
* main tile still needs to be adapted
* main tile of former +tower map is now part of the +urban map theme
* a comment should tell something
* removed the original, static +laboratory map, the building is now part of the +urban map theme
* removed the unused UFO tiles from +urban map theme
* map [+urban] revised 'stadium' assembly

* cleanup and some minor improvements in ub_stadium.map
* assembly uses dummy tiles for more diversity now
* map [+urban] revised 'city_disco' assembly

* removed content that does not fit the theme from ub_city_disco.map (e.g. playground with grass surface)
* cleanup and minor improvements in ub_city_disco.map
* assembly now uses dummy tiles for more diversity
* map [+urban] reduced the height of the dummy buildings to three levels

* this looks more natural, because most of the main buildings are rather small
* map [+urban] assembly community_centre - use dummy buildings instead of empty filler tiles
* map [+urban] assembly stadium - use dummy buildings instead of empty filler tiles
* tweaked assembling of laboratory map
* tweaked assembling of mart map
* completed the urban_buildings assembly definition and enabled it for the campaign
* extracted the second building from former +bomber_city (ub_main) map and use it in the +urban map theme
* removed the bomber_city (= ub_main) map, it is now part of the +urban map theme
* If a hurt trigger didn't actually hurt the actor don't count it as triggered.

* Special thanks to freakyd (See patch #5355)
* removed unused tile descriptor
* fixed wrong name for +urban map office building in LICENSES