Refactor/restructure code

[SDScandrettKint]

Closes issue #1

Code has been refactored into the following structure.

arches_project
│   arches_project.py
│   resources.py
│   pb_tool.cfg
└─── core
│   └─── arches
│       │   connection.py
│       │   resources.py
│   └─── utils
│       │   format_url.py
│       │   geometry_conversion.py
│       │   reset_selection.py  (empty, needs deleting)
│   └─── views
│       │   logging.py
│       │   stylesheets.py
└─── icons
└─── stylesheets
└─── ui

this arches_project dir is contained in the arches-qgis project, and the metadata, readme, licence, requirements etc still exist at the root level.