Remove linelist specific code

[chartgerink]

This PR is about removing linelist specific code that is not necessary for datatagr, while also keeping in mind that linelist needs to be compatible with minimal/no breaking changes. Specifically I set out to do the following:

• Fixes #21
• [x] Make the defaults more flexible (remove epi specific defaults)
• Revisit allow.extra (as everythign is extra now there are no defautls) --> now #22
• [x] Update/Remove unnecessary functions (that were geared towards the epi defaults)
  • [x] 🗑️ tags_names()
  • [x] ♻️ tags_types()
  • [x] 🗑️ tags_defaults()

The current PR is not perfect in terms of final state of the package, but it is a step to generalize the package away from the linelist specific items. ♻️ means it is adjusted, and 🗑️ means it was removed.

[github-actions[bot]]

This pull request:

• Adds 0 new dependencies (direct and indirect)
• Adds 0 new system dependencies
• Removes 1 existing dependencies (direct and indirect)
• Removes 1 existing system dependencies

(Note that results may be inacurrate if you branched from an outdated version of the target branch.)