Rolling EMAVWAP with Standard Deviation Bands

This is experimental code trying to implement exponentially decreasing weights over time in a simple VWAP.
Also i applied EMA rules when calculating the Standard Deviation Bands.
The script produces results from 1 candle.
There is an "log space" option to neutralize bands shifts when charting in log space - this gives the correct geometrically equal distances on both sides of the emaVWAP.