Added License, Minor Updates

Minor housekeeping updates

Added SeededRandomSingleton

Added a simple Singleton node script that users can Autoload to their projects.

Bugfix for get_at_index()

Bugfix for get_at_index(). Will work with newly initialized sequences.

Moved files

Moving files so that AssetLib import is cleaner.

Added Non-Integer seed support

By utilizing the hash() function, non-integer seeds are now supported.
This notably allows string seeds, such as those common in procedural generation to create 'memorable' seeds.

v1.0

Initial release of the module.