Convert main scripts to console entry points

[sunny1401]

Fixes #610

Proposed Changes

• Moved all interactive to within cli as in the comments here
• Updated the setup file
• Removed the prior scripts
• Updated to major version change to avoid breaking anything

Checklist

• [x] I have read the CONTRIBUTING guide.
• [x] My PR is based from the current GaNDLF master .
• [x] Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change.
• [x] Function/class source code documentation added/updated.
• [x] Code has been blacked for style consistency.
• [x] If applicable, version information has been updated in GANDLF/version.py.
• [ ] Usage documentation has been updated, if appropriate.
• [x] Tests added or modified to cover the changes; if coverage is reduced, please give explanation.