Add additional Bulk Actions

[JoeHana]

Additional New Bulk Actions

It would be useful to have the following actions available:

• Offer
• Item not available
• Hide Map for this Listing
• Exclude from Listings Map (needs to be done from the wpsight/wpcasa-listings-map plugin)

Bonus

It should be possible to also add custom bulk actions through the creation of the listing details. This would be especially useful for users who add their own custom listing detail and want to be able to have it in the bulk edit available.