Allow offline Scripts with the Manager

[ChristophLHR]

currently

local script = scm:load("unknownScript")

returns nothing.
It would be great if it would not only return the default "require" if it does not find the script, so that it at least is loaded,
it would be even greater if it would use the same search as default search in lua, as that would enable it to scan all

--@requires

instances within the script as well.

The script should not be added to the scripts Table in SCM, as there would be nothing to update etc...