Templating mechanism

[solusipse]

It's very unstable right now. It should be entirely rewritten.

[RicoAntonioFelix]

What are the specifications for this mechanism?

[solusipse]

I've deleted my last comment and implemented draft it contained into ureq_impl.h, please, take a look. There are also some comments that describe what should be done there. Thank you!

[RicoAntonioFelix]

Awesome, I'll have a look...

[solusipse]

In commit 9b587d3 I've added functionality of parsing values, that were returned from user functions. Btw, I'm also planning to add a mechnism for including other template files.