Replace track generator

Closes #87 (moved). Replaces track generator with new track generator created by @Dougal-s.

Incorporating the track generator involved some significant changes:

1. Created three sub-packages within a new eufs_tracks python package:
   1. track_generator contains the code for the new track generator and its GUI
   2. converter_tool contains the code for the conversion tools and its GUI
   3. cli contains a cli command to use with eufs_cli
2. Removed png and track generator raw outputs from converter tools

Closing MR since the branch that holds this changes has been merged into release-candidate !171 (closed) . See here.