* Add support for null chart points
- Add support for null value chart points, updating existing and adding
new unit tests
* Minor selfreview tweaks
* Address review & fix deserialization bug
* Ignore null values when using NullResultValueTypeJsonConverter
* Narrow NullResultValueTypeJsonConverter conversion support
* Allow inherit of series sampler
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* Candlestick charts base implementation
* Series and Candlestick series json serialization
* Some cleanup
* Add AddPlot method for candlestick series to QCAlgorithm
* Remove Values property from ISeriesPoint
* Add candlestick QCAlgorithm.Plot trade bar methods
* Implement candlestick series re-sampling
* Add more SeriesSampler unit tests
* Add examples of candlestick charts usage to exisiting charting algorithm
* Address peer review
* Address peer review
* Derive Candlestick from Bar
* Sampler changes
* Add new series types from the cloud
* Add more candlestick series sampler tests
* Minor cleanup
* Minor changes