New version of non-repainting step stochastic indicator.

It has been upgraded in multiple ways :

• code is completely rewritten and optimized
  
• step stochastic calculation is a function now (easily usable from any other code)
• indicator has alerts now
• indicator is multi time frame now
• indicator has an option to filter (smooth) prices using one of the 4 basic average type
  
• indicator has an option to use smoothed or regular atr for calculation
• indicator can use the set of 22 price types
  
• ...

By default the indicator is using a very mild price filtering, since it does not add lag to it this way and the false signals are significantly reduced.