Add customizable filter for ranking "Priority Targets"

[jchate6]

Possibly related to:

• 1034

  The Target Listpage should have a "priority" filter that is set by default. This filter should be a customizable filter that selects and ranks targets based on some criteria. This could possibly be accomplished by a MatchManager in custom_code if we allowed for match managers to act as custom filters.

  Another solution (that might be worth implementing as well) would be adding a filter connection point to the target list page, so that an app could add custom filters here without overwriting the page.

[jchate6]

Needs to handle multiple priority types and custom headers on the list tables