Start work on v2.0

Began working on a major refactoring for v2.0, along the same lines as was
done for the PHP library.
Removed all version/API specific tests, keeping the most recent ones.
Move FF69 adapters into generic Adapter namespace
Rename Util to RenderHelper
Add folders for new project structure

Added directories and namespaces Core.Client, .Page, .Server and Util, to
mirror the PHP structure. Also moved a few unimportant classes into these,
so git adds the folders.
Clean up "global" FactFinder namespace
Move Configuration into Core
Restructure test project accordingly
Clean up usings
Seperate concerns in ParametersHandler

ParametersHandler has been split up into ParametersConverter,
RequestParser and Client.UrlBuilder.
Add test for RequestParser
Add test for Client.UrlBuilder
Move JSON helpers to Util
Merge inheritance of TagCloudAdapter
Merge inheritance of SuggestAdapter
Remove SCIC adapters
Remove 'Adapter' from class names
Merge inheritance of SimilarRecords adapter
Merge inheritance of Search adapter
Remove ununsed default adapter
Merge inheritance of Recommendation adapter