Removed StdAfx.h
Lots of changes. Details below:

- Added a _ prefix to private inst vars.
- Deleted all unnecessary "this->".
- Deleted reference to "StdAfx.h" and replaced by "Arduino.h" directly.
- Added methods PE::getMillis() and PE::delayMS(long).
- Renamed StackVM's inst var "_arduino" to "_pe".
- Added delay primitive.
Added ReadStream class, which would wrap a char array and allows us to easily parse a program from it.
Fixed creation of StackPrograms. Now it will correctly handle literal/locals sections with variable length instead of allowing a byte as max value.
Fixed example programs to comply with the new structure.