Regex Filters for Events

[NatVIII]

Is your feature request related to a problem? Please describe.
One issue with rva.rip's layout is that events and items can tend to clog the screen. If you know there's events you won't want to interact with, you ought to have the option of not interacting with them or having them clutter your view.

Describe the solution you'd like
Filters ought to be implemented which are able to search the content of calendar events via regex. The content that regex filters ought to be able to filter are content description, location, title, calendar source name, and calendar source tags (which is a new field which would be added to EventSources.json).

In addition, activated regex filter tag chips ought to be visible wherever looks best (probably somewhere at the top of the calendar if this is possible, as of writing I've not investigated if this is possible). They should only appear when they are active, and always feature a distinctive X on the right side so it's easy to intuit how to close them.

Filters can be activated via a "filters" button next to "today" on the top of the FullCalendar which opens a modal. This modal ought to feature a search bar as well as possibly some suggested tags (feel free to push these off to a future issue if that represents an issue during development).

Additional context
Some other related plans after this is done is to add suggested location tags (Henrico, Richmond, etc) as well as event tags (biking, hiking, protests, etc).