Feature request: export to C

[tpn]

First of all, this is awesome. Compiled straight out of the box (albeit after I commented out the static_assert on PropertyTree.h:230), and works fantastically.

Just reporting that I think this project is awesome is like, 95% of why I'm raising this issue.

But given that I'm here, here's a feature request: it'd be amazing to be able to export the EMF calls into a .c file, you've basically done most of the work, it would just need a bit of finesse converting e.g. EMF_SELECTOBJECT -> SelectObject(hdc, ) etc.