EMVWAP

Added Exponential Smoothing to The Original Built-in VWAP Calculation.

Best used with original VWAP indicator to identify trend reversal.
- VWAP CrossUp EMVWAP identify bullish reversal
- VWAP CrossDown EMVWAP identify bearish reversal

All inputs are the same as the original VWAP with one addition.
Average Length: Identify the the number of historic bar to calculate the exponential moving average of VWAP