Bug fixing on quick drives

There has been another update for the South London and Thameslink Route.

*Minor Updates to scenery
*Trackwork between Loughborough Junction and Blackfriars(with Signals, Speed Limits and a Correct Flashing Yellow at Elephant and Castle - diagrams say so on the latter)
* Quick Drives at Beckenham Junction and a few via Elephant & Castle (not all of them just a few)

Changes

Scenery between Crystal Palace and Beckenham junction more complete
Night Lighting and Tunnel Occulsion around City Thameslink.

• Scenery updated but not finished (still quite a bit to do - had a tough week so didn't get that much done unfortunately)
  
• More quick drives added (but only basic ones - e.g. Bedford to Brighton and Moorgate and Vice Versa)
  
• Track Tweeked at Beckenham Junction
  
• Added missing signals at London Bridge (towards Blackfriars) and Prior to Burgess Hill
  
• Fixed dodgy OHLE at Mill Hill Broadway! (and removed more heather terrain texture on track)