Simplify Simila configuration

[mehrandvd]

Previously Simila configuration was heavily designed based on dependency injection concepts, which was too complicated for the context.

We should make the configuration process much easier by:

• Configuration over convention
• Creating a SimilaFactory accessible by Simila.Create() to facilitate creating configured Simila.

var simila = Simila.Create()
   .Treshold(.7)
   .CaseSensitive(true)
   .PhraseComparer()
   .WordComparer()
   .CharacterComparer()
   .Build();

‍‍‍‍‍‍‍