[HM] VWAP Envelope dinamic intraday v1

- VWAP, volume weighted average price;

- Plus Envelope bands:

1) Dinamic, adjusted by volatility:
- - - daily ATR or
- - - daily Standard Deviation
2) or simple fixed % increments bands, defined by user.

# Intraday timeframe only.
# If volume data is absent, the indicator will not work at all.

Hope this could help the community.