plug-ins: clean the new Spyrogimp, rename it and remove old version...
... from menus. The script-fu version is still available through pdb (for scripts) and even in the action search. But in menus, only the new Python version will be shown. Also update the description and name of the old version to make clear it is deprecated in favor of the new plug-in. Finally rename the new version to simply "plug-in-spyrogimp" (dropping the "-plus" part as we should consider it as a replacement rather than as another plug-in, which the "plus" would imply). Anyway the old one was called "script-fu-spyrogimp", so there is no name clash. While at it, do some trailing whitespace cleaning in the new plug-in. (cherry picked from commit 8729f9a6)
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