Added support for MatchNamesWithUnderscores and ctor parameters

[andreas-antoniou-cko]

Fix for #818

[agjini]

Thanks for your fix. Looking the test it seems to work as expected. I allowed myself to make some comments on your code.

[NickCraver]

Looking through this, I'm pretty sure it's a breaking change. It's not a new option, so people will have it on - the case of say ColumnName and Column_Name existing creates a conflict - anything differentiated by an underscore would be impacted by this. I can think of cases within the Stack Overflow API this would happen, as we use underscores or multiple underscores to differentiate some parameters there. In short: I don't think we can do this.

Perhaps how we map to constructors needs to be pluggable, like thinking in #722 for columns?