Edited MultiMethod test
Moved string methods from Z.cs to Strings.cs
Moved Numeric methods from Z.cs to Numbers.cs
Moved function combinators from Z.cs to Funcs.cs
Moved general object methods from Z.cs to Objects.cs
Moved collection methods to Collections.cs from Z.cs
Moved Seq builder method to Seq.cs
Moved boolean functions to Booleans.cs
Added some 1st class functions to Z