Improved parsing of skillfile

Improved parsing of the skillfile in such a way that the dictionary
that's returned, contains the skill names as keys, with for each skill a
nested dictionary with entries for each level. Each level has a nested
dictionary value that contains the relevant attributes.
Create a basic GUI with build URL box, passive stats box and skill boxes

Added code to the gui.py module to create a basic GUI with a box for the
build URL, including a button to load a new build, a large box to
display bonuses from the passive tree and gear, and dropdown menus to
select active skill gems and supports
Move additional files to /files directory

Moved the files that are non-script files to a separate directory, also
added some new files that were created for testing purposes/certain
functions of the PoE app that were not yet pushed to github