Added demolish ride prompt
Merge pull request #545 from duncanspumpkin/demolish_ride_prompt

Added demolish ride prompt
Added code to call sign windows
Added window_sign. Invalidate function to be finished
Fix remaining bugs with window_sign(large)
Added window_sign_small
Fixes none generation of tracks.idx. This is not how rct2 does it
Merge pull request #547 from duncanspumpkin/fix_426

Fix #426
Merge pull request #546 from duncanspumpkin/window_sign

Window sign