Implement customizable toggle windowed mode shortcut

Fixes #2529: Time overflow when unlocking dodgems' operating limits
Fixes #3424: Max. people on ride overflows when operating limit is unlocked

Fix #3481: Enable smoothing terrain transitions

Clean up some magic values and refactor a bit

When enabled, this cheat allows users to set any train length between 1 and 64, regardless of station length or the normal maximum and minimum length of the train. It also increases the supported maximum length of trains from 16 to 64. It should be noted that rides with trains longer than 16 will not be backward compatible.

It is known not to work on tower rides or on the reverse freefall coaster - I'm not exactly sure why, but it doesn't seem too much of an issue for now. Also, if there is not room behind the station for the extra cars (either because it's a shuttle coaster or because there's a track merge), then they all just layer on top of one another. I'm not sure what can be done about it - ideally you'd limit the trains to what will fit, but that means traversing the track to determine how much room there is, which seems excessively complex.

Closes pull request #3192

Mostly style fixes, includes minor change to make sure spinner's down
button gets shown, update to string IDs, network version and making sure
correct string gets selected based on car count.

Remove calls to ride_entry_get_train_layout and replace with calls to ride_entry_get_vehicle_at_position