Update search paths to use Support layout

[onecrayon]

• Scripts: the scripts that actually power TextActions or FileActions
• Library: generic scripts; primarily useful in the JSCocoaLoader bundle or by Sugars that need generic scripts to power their functionality
• Tools: binary files, etc. that are leveraged by the scripts
• Resources: text files, graphics, or whatever that are leveraged by the scripts
• Tests: if the Sugar has any testing files/resources/etc. they'd go here
• (room for future expansion)

When loading a script, JSCocoaLoader would look here:

1. User's App Support folder => Support/Scripts
2. Sugar that defines the action => Support/Scripts

Calls to importJS('scriptname') would search:

1. User => Support/Library
2. Sugar => Support/Library
3. JSCocoaLoader => Support/Library

If a second optional boolean parameter is passed to importJS(), it will search in all known paths (on the off chance that someone needs to load another item in the Scripts folder). So User => Scripts, Library; Sugar => Scripts, Library; JSCocoaLoader => Library (unless you want to bundle some actions with JSCocoaLoader itself, in which case it would have a Scripts directory, too).

[onecrayon]

This change is complete; if Javascripts need to figure out where to find files outside of Support/Scripts or Support/Library they can get the paths to the Support folders from JSCocoaLoaderController.supportPaths.