Handle automation scripting prefix, for removal

Currently Studio adds a "javacript." prefix on automation scripts.
This is not consistent with our model, and people cannot easily guess it either.

=> This prefix should be removed gracefully.

In order to do so :

• A boolean flag "isPrefixRemoved" should be added to the model
• The boolean flag's value should be null / false for existing scripts

=> When this flag is false or null,

• The feature should appear as prefixed in the listing and in the feature editor.
• The feature should also appear as prefixed in the automation chains screen.
• The builder should prefix the feature as well, just as we did it so far.

=> When a script is renamed or created, the flag should be set to true.

=> When this flag is true,

• the feature should appear as is (no prefix) in the listing, the feature editor and automation chains screen.
• The builder should not add a prefix.