ScriptFu: Add script-fu-interpreter akin to other interpreters
Why:
- users can install .scm scripts to plug-ins dir
- Crashing scripts do not crash extension-script-fu
Scripts (.scm files) have a shebang and are executable and in a same-named subdir of plugin dir.
Interpreter/scripts create PDB procs of type PLUGIN unlike extension-script-fu which creates PDB procs of type TEMPORARY, owned by extension-script-fu.
Unlike other interpreters, the interpreter is-a plugin outright, not by virtue of the script subclassing GimpPlugin and using GI.
Edited by Lloyd Konneker