Refactor: deload updating mydata from slope selector

[m-kolomanski]

TODO: I have messed up with the base branch, update base when #184 is merged
TODO: Wait on #177 to be merged

Issue

Addresses #121, #144

Description

• Updates slope_selector so that it no longer updates mydata object. Apply button has been removed. Instead, the user should click on Run NCA in order to update the results, which is handled by nca.R.
• Adds warning stating that settings has been changed and the analysis must be re-run.
• In addition, table for viewing active selections/exclusions has been modularized and only updates when results have been recalculated.

How to test

TBA

Contributor checklist

• Code passes lintr checks
• Code passes all unit tests
• New logic covered by unit tests
• New logic is documented
• Package version is incremented

Notes to reviewer

TBA