March Release Candidate

First limited Customer Release Candidate. Includes the following changes from our hackathon:

• EDC support for filtering
• EDC support for array of primitive types
• Support for OnUpdate, OnInsert, and OnChange; remove LastOperation support
• Change @ to denote an active field; remove requirement for field to be marked Active in DDL
• Added support for rule_context in rules
• Enable custom exception handling for the rules engine
• CMake helpers for processing/translating DDL/rulesets
• Ability to have comments in a .ddl file
• Many fixes throughout the product