Feat/v2

[Jamess-Lucass]

This PR is for a rewrite of Goatquery, what I call the v2 (despite being tagged still as 0.x.x, because from 1.x.x I will employ semver and will have minimal breaking changes).

This rewrite consists of:

• Splitting out the repo to multiple projects, GoatQuery and GoatQuery.AspNetCore.
• Moving the core library lib to support netstandard2.0 onwards.
• Removing the dynamic linq dependency.
• Addition of a lexer, parser and evaluation to provide more safety for query strings provided that need to be evaluated to linq expressions.
• Addition of FluentResults.
• Removal of select functionality, this may see a return in a later version.