Enhancement: Drop down list of reasons for exclusion

[js3110]

Description

Instead of having custom input, have a dropdown list of reasons for exclusion or selection.

Definition of Done

The requirements for the feature to be complete:

• [ ]Dropdown list of exclusion/inclusion options

[billdenney]

Related to #125

FYI, PKNCA has robust data exclusion methods that should work across all parts of the data (input concentration, input doses, calculated results). More details are here: https://billdenney.github.io/pknca/articles/v07-post-processing.html#modifying-results

If you have a common scenario that you want to exclude, please use those methods as they will exclude all results that are calculated from excluded parameters.