Custom Tachometers and Boost Gauges 3.1.0

Fixes a few more issues from the 0.23 update as well as refixes the issue of electric vehicles not showing the tachometer app properly.

• Fixed electric vehicles not showing up on the UI
• Fixed apps dissappearing completely every now and again
• Fixed wrong classes being used to access certain methods
• Some more code cleanup

This update focuses on fixing the apps not appearing after the 0.23 update.
I was in the middle of refactoring everything and so there are a lot of behind the scenes changes, but not yet any new apps (more is planned and will come at some point in the near future ).
The pointer dial on the tachometer app now highlights itself when the engine should shift up.

This small update fixes electric vehicles and other miscellaneous vehicles from not showing the tachometer UI.

The UI also now changes size according to the size of the UI box. This is a temporary/quick fix that add in his feature, however, do note that making any UI much bigger (around 150+%) can cause blur. I intend to try and get this resolved in a future update however the basic feature is at least implemented

A quick update that fixes the inaccuracy of the temperature and fuel bars.
The preview images on the UI selector have also been updated.

This update bring ssome changes to the current UIs:

• Added in the fuel and temperature as bars on the inner part of the tachometer UI
• The font has also changed to something much more readable - it may change again, but for now, it is much better and cleaner
  
• The tachometer UI now hides itself when a vehicle that has no engine data is spawned (such as trailers)
• Major cleanup of the code behind the scenes - some small changes can probably be noticed due to this, most...