Move SMT components into own module

- Refine some component measurements
Remove no longer needed clearance box
Add positions for power and status LEDs
Use switch position from Sparkfun Pro Mini
More regular layout of sandbox models
Use centre line along y as datum for SMT components
Whitespace fixes for MicroUSB vitamin
Adjust header spacer and reset button colours
Merge pull request #35 from snhack/arduinopro-vitamin

Add LED positions