Implemented sqrt() and pow() functions (main.ts)

[davidmann4]

Inspired by PR #16 I reproduced the changes in main.ts

What do you think? Tested it on my local instance:

[davidmann4]

I also noticed that package json has Sigma

while package-lock has a different value

[davidmann4]

Btw thanks for the plugin, I use it a lot for quick math in my notes!

FYI I plan to add some config settings in future Pullrequests:

• remove sum per default
• format numbers with . or , in settings (1.000.000 vs 1000000 vs 1,000,000 vs 1 000 000 )
• style settings

[davidmann4]

@monesga ping