Add ability to define require template. var/const and single/double quotes

[liubko]

I could be useful to have ability to specify type of variable declaration var/const, and choose between double/single quotes.

I have linter issues when using baggage-loader because of this. So I had to move baggage-loader to postLoaders

[deepsweet]

https://github.com/deepsweet/baggage-loader/issues/11