Fact: Rebuild as node

[aaronschachter]

Rebuild Fact module to create new content type, Fact, instead of custom entity.

This will allow use of EntityConnect for adding/editing facts "inline" from a campaign or fact_page.

Details:

• Drop dosomething_fact table, remove install schema, and entity hooks / classes
• Create "fact" content type with body for Fact copy, and Source multi-value longtext
• Updating all Fact EntityReference fields to point to Fact nodes (not Entities)
• Displaying campaigns_by_fact views on the Fact node content
• Node access check to only make Facts pages visible to staff
• Change Fact Search to search Fact nodes
• Update Fact permissions