Add prefix to nested modules

[EdLichtman]

When nesting modules, add a prefix. In add-quickfunction perhaps we need to raise exception if no module exists? Cause prefix should be optional and default to name of module. Also should have map of prefix to module in a get-quickmodules command.

https://www.sapien.com/blog/2016/02/15/use-prefixes-to-prevent-command-name-collision/

[EdLichtman]

Diving in deeper, it seems adding DefaultPrefix to a nested module causes it to break. Instead we can add DefaultPrefix to any "Split-QuickModule" command.

Another thing to add is, perhaps we should add DefaultPrefixName as "CLI". It means any Nested Modules will use the Prefix Name, so I'm not sure if forcing the user to use DefaultPrefix is a good idea.

Regardless we need to adapt to allow for -PrefixName flag. In each of the functions that Look for NestedModule, find if a Prefix is applied using

(Get-Module Home).Prefix

Then add the Prefix to it.