Stochastic with Oversold/Overbought levels color

Modification of original Stochastic covering:

• dynamic color of smoothed Stoch if overbought or oversold levels reached
  
• added inputs to Settings to define Oversold/Overbought levels dynamically
  
• removed color fill what only makes indicator harder to read
  

リリースノート:

Additional Information:
- Stochastic is now simplified when it's coming to display (one, smoothed line shown)
- Stochastic line is being colored when it exceed Oversold and Overbought levels
- script together with DMI and OBV is working very well as additional confluence when taking trades; DMI is additional oversold/overbought indicator that can be checked together with Stochastic + OBV is showing also potential reversals via Divergences