Airlocks take time to weld and unweld + Feedback messages and sound
adds "start" sound to welding, un-gimps the range of the "ending" weld sound
Lockers now take 40 ticks to weld + Sounds + Feedback messages
Minor reformat of code for Locker welding
Merge pull request #3946 from RemieRichards/16/06/2014-AirlockWelding

Airlocks and Lockers take time to weld and unweld