Mostly fixes and clean up.
Mostly fixes and clean up.

Changelog:
* Thumb public class is now based on proper getter/setter methology
* Rename various variables to human readable
* Deprecated get/setThumbValue functions
* Removed private calculateThumb* functions as they are now obsolete
* Remove old comments
* Code clean ups

niqueco/RangeSeekBar,Larpon/RangeSeekBar