Update roadmap: plan to add the function forEach() instead of foreach()
Add first unit tests for lb.core.plugins.array
Add unit tests for forEach, map, reduce in base.array

These unit tests are copied from nada [1] and nadasurf [2] projects (CC0).

[1] nada project on GitHub
https://github.com/eric-brechemier/nada

[2] nadasurf project on GitHub
https://github.com/eric-brechemier/nadasurf
Add implementation of forEach(), map(), reduce() in lb.base.array

These implementations are copied from nada and nadasurf projects (CC0).
Complete unit tests for forEach, map, reduce in lb.core.plugins.array

These are the same unit tests as in lb.base.array.
Add implementation of lb.core.plugins.array

The functions forEach(), map() and reduce() are aliases to functions
of the same name in lb.base.array.