Support sprig template function

[pesimon]

I'd be nice to support sprig functions inside templates.

[daidokoro]

Hi Peter,

Thanks for trying Qaz.

I had a look at the Sprig Template functions and you're right, they'd make a great addition to the overall template functionality of Qaz.

Happy to implement this however, I won't have much time given the holiday season to do much till next year.

If you want, you can submit a pull request and i'd be happy to review. Alternatively, i'll add this with next version in January.

Thanks again.

Shaun