* Implements wrapper to get the exchange as a single letter representation
Also replace lower 'l' with capital 'L' in condition flags enums. it is a new warning on the compiler and it looks cool :)
* There are cases where the exchange is null or empty, in those cases return null
* Add tests for single character exchange representation
* Update GlobalTest.cs
Co-authored-by: Martin-Molinero <martin@quantconnect.com>
Juan José D'Ambrosio
df4abd3c3a