Classic UI 1.8

Small update to fix a few things and added a simple powertrain app.

Added Classic Powertrain App (WIP)

• Fixed values erroring when first adding the Classic Menu app (causing options to not be changeable unless you reload the UI)
  
  
• Fixed dropdown menu overflowing the "BeamNG Logo Style".
  
  
• Fixed not being able to click apps in the right corner of the screen (the overlay of the Classic Menu blocked it even when it was closed)