Port all plug-ins to retrieve the layers
directly from the image rather than
having them passed in. This resolves some
issues with introspection and sets the
foundation for future API work.
Resolves#10932
Since GIMP distinguishes between saving
XCF and exporting image like PNG,
we should change the PDB to show
export rather than save in the function
calls.
If we leave a space between the macro name and opening parenthese for argument
lists, the args are not considered macro args (which will be discovered when
using it). I experienced this issue while testing code on some plug-in
yesterday, so thought I might as well fix all these broken macros for casting to
the specific GimpPlugIn subclass, so that we won't have a next time.