FIX: Crash on shutting down in some cases
FIX: Network desync in some cases when deleting roads
FIX: Special signals would not operate as such when a train was starting from a stand from them.
CODE: Remove deprecated code
FIX: Passengers/mail/goods did not properly load whilst reversing (they now load just as the convoy has finished reversing).
CODE: Minor whitespace changes.
Merge branch '11.x' into devel-new