Button Changes

Changing the setup buttons on the config interface as part of <a href="https://github.com/Freeseer/freeseer/issues/411">Issue 411</a>. 

- [x] Remove text from setup buttons on Recording tab
- [x] Use gear icon on button instead of 'Setup' on Recording tab
- [x] Use gear icon on button instead of toolbox icon for plugins (click on a plugin and see the listbox on right hand side

<a href="https://docs.google.com/document/d/12VwsurnMOcXSFQlQKo-ZIzozvFD3-bPSEudDq5L9un8/edit?usp=sharing">Project proposal document</a>