Added a new scripter plugin

I think the new scripter is better than the scintilla one
Merge pull request #10 from fatcerberus/master

SoundPicker indicator icon hotfix, Sphere API menu item
Scripter now in beta

The new scripter is really quite nice; lacks autocomplete.
Unregister plugin events on destroy

Switching between plugins handling the same file extension required a
restart before, this fixes it