Events Calendar - Githubissues

Import and structure

[x] Adapt Involvement taxonomies to also apply to Events.
[x] Import meetings as events
[x] Meetings that are children of Involvements that are already existing should be imported as children of those involvements.
[x] Work out consistent and human-friendly method of URLs.
[x] If no schedule and only one future meeting, import only future meeting, containing all info from Involvement
[x] If multiple meetings, import involvement and make meetings children of it.
[x] Use Sites settings to determine which involvements are included
[x] Include images
[ ] ~~Once an event is a certain distance in the past (a month?) move to a different URL to clear space for similar ones.~~
[x] A whole bunch of additional settings
[ ] Gracefully handle the situations where Meetings are deleted in TouchPoint.
[x] If an involvement has meetings in the past and the future, only update content for meetings in the future.
[ ] Allow an Involvement EV to set the slug (likely requires #17)

[x] How to indicate when an event is "featured"
[x] How to handle Involvements that have schedules, but not future meetings. (next occurrence per schedule only?)
[ ] How to save, store, transmit targeting information