Create a Versatile Collections Macros Repo / Package

[rotexdegba]

• Create a Versatile Collections Macros Repo / Package containing various callables and static methods which can be added to collection instances via one of addMethod, addMethodForAllInstances or addStaticMethod

• This repo should be the home of new collection features that are non-essential. This way the CollectionInterface doesn't keep getting longer and longer with the addition of new methods.