RCT1 vehicles

[spacek531]

A while ago @Gymnasiast (I believe) mentioned importing RCT1 vehicles. There currently is the ability to add this to OpenRCT2, although it is not in an ideal state because there will be many sprites wasted.

This branch solves the waste of sprites for the most part, and is the branch against which the current vehicles are created:
https://github.com/spacek531/OpenRCT2/tree/frames-rotation-count-part-1

This vehicles repository:
https://github.com/spacek531/RCT1Vehicles

The vehicles in the repository could be merged with this repository after some tasks are complete.

Although it is relatively simple to load appropriate RCT1 vehicles only when necessary, users loading a park that has been touched originally by a linked version of OpenRCT2 will not see any sprites. This may or may not be an issue.

[spacek531]

Duplicate of #138