Add read directory to filesystem extension

[arthuro555]

Adds an action to read a directory to the filesystem actions.

[arthuro555]

(This should be ready for review)

[RebornOfc]

Thats great, but what if instead of reading every sub-directory at once, the user can insert a depth limit?

-1 = everything
0 = only the main level
1 = only the main level and its sub-directories
2 = (...)

[Cheapetsgrow]

Two passed with flying colors

[arthuro555]

Thats great, but what if instead of reading every sub-directory at once, the user can insert a depth limit?

The implementation is not recursive, it should only read the contents of the directory, not sub directories. A recursive read can be done through a loop.