VWAP Alerts V2

Alerts added to "VWAP Stdev Bands v2" by SandroTurriate

Changes
-Adjusted trigger conditions for higher signal sensitivity
-Color change on bands and signals for better readability and ease on the eyes
-Alerts added for up to 4 deviations up and down
-Re-enabled deviations 4 and 5
-Re-enabled previous close