332, 412 Map - custom markers, pin popup data fetching, clustering tweak

[adamkendis]

Fixes #332
Fixes #412

• Map pin fetches data for its srnumber on click.
• Pin popup displays spinning loader while fetching.
• Pin popup displays requesttype, ncname, address, createddate, and closeddate OR updateddate and status on successful fetch. Note: city name is not provided by the city in request info. I think we would need an external API (with costs) to match city name to zip or lat/lng, or handle this on the backend if city name is required.
• DataRequestError modal is displayed if unsuccessful fetch.
• CustomMarker which replaces default leaflet markers with fontawesome map-marker-alt icon in our Icon component.
• Custom markers are color-coded to match request type colors in menu (and REQUEST_TYPES constants).
• Added 'fullType' property to some requests in REQUEST_TYPES constant. We shortened the 'type' of some requests for display purposes ('Graffiti Removal' -> 'Graffiti', 'Electronic Waste' -> 'E-Waste', etc.)

Loading popup:

Closed request:

Open/pending request:

• Up to date with dev branch
• Branch name follows guidelines
• All PR Status checks are successful
• Peer reviewed and approved