Is your feature request related to a problem? Please describe.
There is no mechanism available to bulk edit Markers.

Describe the solution you'd like
Port the conventional grid view bulk edit modal window to the Markers view, available using the e hotkey or from the overflow/operations menu button.

This would also entail the ability to select multiple marker "cards" using a card checkbox element on each.

Additional context
Selecting multiple markers using the checkbox would throw a wrench in marker functionality.

Typical marker behavior is:

• Hover over marker
  • Marker card expands in size

Marker with checkboxes could work like this:

• Hover over marker
  • Marker card expands in size
  • Checkbox is available to select marker
• Checkbox is clicked
  • Markers no longer expand in size when hovering
  • All marker cards get a visible checkbox for multi-select mode.