* Adds new unit tests covering changes and testing for old case
* JsonConvert.SerializeObject would convert a `null` value into a
literal string of "null" when writing to a file via the ToLine
abstract method. We opt for an empty string whenever the underlying
value is null so that the parsing works correctly later in the
data loading cycle.
* We now use the time at which Smart Insider added a given event to
their database. Because time indexes for Smart Insider are now
non-duplicated per symbol, the History request will properly work.
* Add new fields to Smart Insider enums (EventType, ExecutionHolding)
* Reroutes Error variant to SatisfyStockVesting in ExecutionHolding
* Adds additional documentation clarifying unknown fields
* Adds unit tests for Intentions and Transactions
* Enables SEC test that was disabled
* Self review - Fix typo in SmartInsiderEventType
* Self-review: Add additional documentation to missing SmartInsiderEvent fields
* Adds and removes various fields from enums to represent data accurately
* Renames various variables
* Changes algorithms to work with new changes
* SmartInsider transaction/intention docs updated
* Added new enum values to represent pieces of data
Gerardo Salazar