removed redundant default mini bridges
replace misleading Underwater bool with what it really does
define torpedoes in a more generic way

fixes #3252 and closes #2097
update CHANGELOG
new Bridge terrain type with grey minimap color
allow invalid terrain targets for Air/Water bound weapons

made terrain targeting consistent with actors
allow to C4 intact bridges that have taken some damage
this is not just ShowMuzzles anymore
temperate roads should be brown in the minimap
remove unused interior terrain types

no smudges on high walls
Merge pull request #4407 from Mailaender/torpedo-bridges

Made torpedos not travel through land, but destroy bridges