Add offset multiplier to a source

[GitittomeNow]

Hello, my very first github posts...

I love your power wheel card!

For some reason my Enphase solar reporting in home assistant is 33% less than actual in the Enphase app. I should find the reason for that. However, on thing that would be helpful with power wheel would be to add the ability to add a multiplier to the power input of one of the sources. This is something various power monitor solutions offer to account for monitoring say one side of a two phase load, instead of and more hardware add a multiplier.

Thank you for your consideration!

S