plug-ins/scheme-wrapper: Use GIR for enum values

Merged Niels De Graef requested to merge nielsdg/script-fu-use-girepository into master

This allows our script-fu plugins to use the GIMP enum values, just like all our other plug-ins know them.

In other words:

  • Names are consistent with those of other plug-ins
  • Introspectable enums are automatically added as they are added to the introspection file, without even needing a recompile
  • No need to keep track of our enum types anymore, as that is just a redundant implementation of introspection in practice. This in turn will let us simplify some of the pdb code

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