Reverse the string based MapFrom

[timmi-on-rails]

• Added failing tests

Fixes#3329.

[dnfclas]

All CLA requirements met.

[timmi-on-rails]

Here we go, I am done.
I tryed to keep the changes minimalistic, because I don't understand everything along the way, so I had to rely on a hopefully good test coverage.

Feedback codebase

For me it was hard to follow the code, because the open generic cases are always treated special and this makes the code more complex/nested/partially redundant.
I guess the open generic case should be handled more naturally.
Meaning, we need some abstraction for the LambdaExpression that can handle the open generic case.
A good starting point might be the IPropertyMapConfiguration interface. Maybe the
LamdbaExpression could be replaced by MemberPath.
Haven't thought about deeply though.

[lbargaoanu]

Some cosmetic changes. Hopefully I didn't break anything.
Thanks!

[lbargaoanu]

If this fixes the attributes stuff, you might want to add a test for it.

[timmi-on-rails]

It doesn't fix attributes, but I can work out a fix and test for that.
Do you want me to put it in this merge request here or separate?

[lbargaoanu]

Separate.

[timmi-on-rails]

Ok, your changes look good.

[lbargaoanu]

@jbogard Merge?

[lock]

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