FlightGear - Flight Simulator FGAddon

Problems with instruments not being visible when using DDS Texture Cache which are being caused by transparent textures and/or grayscale textures.

1. Changed all rectangles (that were using transparency to appear as circles) to actual circles
2. Remove as many alpha channels from textures as possible.
3. Ensure that we are using the correct material with ambient and diffuse both being white.
4. Fixed SVG for EFIS PFD