Concurrently search in Any and All

New architecture.
The identification key is not stored as a string, but as a uint64 number.

Context support.
Set and functions of the set package support the ability to work with context.

Aliases.
Long function names has short aliases.

Added module functions: Union, Intersection, Difference and SymmetricDifference.

Bugs solved.

Add new futures: Map and Reduce as functions

Add new futures: Filtered, Filter, Map, Reduce, Any and All.

Fix Extend method