Add fast gate. Useful if you use mod like SUPERSONIC High Speed Train or other fast vehicle mod.

Note:
- it is my first mod, so feel free to contact me for improvement or advice
- Untested with space age but should work fine

changelog:
1.1.0 : update for factorio 2.0
1.0.5 : fix research
1.0.4 : fix an error who give you a normal gate when you mine a fast gate
1.0.3 : fix an error in high resolution texture filename