Making babysteps here

Yup.
Updated st3 project file

The sidebar looks quite nice now
Created ‘Tests’-folder

I put some non-functional stuff with descriptions in there too
Added the beginnings of an YAML parser
Quickly looked at the spec, seems like YAML is more complex than I thought!
I just realized that a YAML-parser belongs in its own project.

Let me introduce, yamil — the fenomenal YAML parser!
(Okay, maybe not so fenomenal as of yet, but hopefully soon!)

 + Added ‘External/’-directory for other project codes.
Merge branch ‘parser’ into ‘buildsystem’