JSON Serializer fix
Implement Fluent Mapping.

Code from https://github.com/elizarovalex/fluentbltoolkit
with changes from me for "MemberMapper"

Licence is also MIT (as you can see here: https://github.com/elizarovalex/fluentbltoolkit/issues/6),
so Merging should not be a Problem
Unit-Tests for Fluent Mapping.
Implement also the Test from here: https://github.com/elizarovalex/fluentbltoolkit
Update Fluent Mapping.

- New Unit Test
- DbType Attribute
Merge branch 'pr/n166_jogibear9988'

Conflicts:
	Source/Mapping/MemberMappers/JSONSerialisationMapper.cs