Multi-select fields

We have added a new multi-select field to the job board

• You can now add a multi-select field to the job board
• Split Job Listings by Plan Tier
• Custom form section now has multi-select as an option
• You can now search for values in the multi-select field
• Categories, locations and job types are now available as multi-select fields
• Update custom fields is now in a Dialog to make it easier to edit
• Fixed missing payment plan in custom pages