Overhaul Klawr Blueprint creation workflow

Klawr Blueprints are no longer associated with a particular script file,
now they are only associated with a particular type defined in the
game scripts assembly (built from game script files) or any other
assembly loaded into the primary app domain. When creating a new Klawr
Blueprint the user can select the C# type they'd like to associate with
the Blueprint. Currently the user can only select a
UKlawrScriptComponent derived type.