* Fix CA1819 and CA1002 warnings
Changed the type of Languages statistic in regression tests from
Language[] to List<Language>. By doing that, the warning CA1819 was
removed but then the warning CA1002 was raised. However, this warning
was expected to be excluded from QuantConnect.Algorithm.CSharp.
* Improve implementation
* Simplify code
* Fix bugs
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* Support CFDs in IB
* Add new currency pair util method
* Minor changes to IB fee model and tests
* Add CFD USA market hours
* Add new Market interactivebrokers for cfds
* Add sample algorithm illustrating manually adding market hours to MHDB
* Update MHDB and SPDB
Ricardo Andrés Marino Rojas