Allow filtering of RSVP statuses

[shawfactor]

Is your enhancement related to a problem? Please describe.

Okay this will the last for today but I think it is a important one and whatever is built should have this in mind

I love the rsvp functionality BUT it is missing attendance functionality. This could be added relatively easilys by adding a to the current array of available statuses for th rsvp table, namely:

'attending',
'not_attending',
'waiting_list',
'no_status',

with a status of 'attended' or 'checked_in'

If this is not possible or not on the immediate roadmap then would it be possible to allow the available statuses to filtered?

Designs

No response

Describe alternatives you've considered

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[carstingaxion]

@mauteri and I discussed today and concluded, that it could make sense to have the statuses be terms in a custom taxonomy, which we wrote down in short in #687 .

Please take a look and add your thoughts to this idea @shawfactor

When statuses become terms, there will probably an easy way to modify them, like you want.