* DividedEventProvider distribution computation
- Update regression algorithm which was using a different reference
price when calculating the dividend
- Adjust divided event provider to compute distribution using factor
file reference price, if not 0. Adding unit tests
- For equities, only emit auxiliary data points for
TradeBar configurations, not for QuoteBars, nor internal.
* Address reviews
- Split and Dividend event provider will throw an exception when there
is no reference price available. Updating `wm` factor file which was
missing references price and regression algorithms using WM.
- Updating unit tests asserting new exception
- EventProvider will receive start date during initialization, this will
be used by the `MappingEventProvider` to correctly set current mapped
symbol
- Adding unit test, updating existing regression test
Martin-Molinero