NLA SoC: Separated 'Built-In Function Generator' FModifier into a separate FModifier

Started cleaning up FModifiers in preparation for allowing them to be used on NLA Strips. 

This commit separates the 'Built-in Function' mode for the Generator modifier out into its own modifier, since it was being quite frequently used (and the RNA wrapping for this used to be quite hackish). 

BACKWARDS COMPATABILITY WARNING:
Old files with FModifiers saved (i.e. old 2.5 files, but not any others) will not load correctly as a result of these changes (the wrong modifiers will be shown). I've decided that there are not likely to be many files affected by this yet, but doing this will result in a much nicer modifiers-define list in the long run.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/editors/space_graph/graph_intern.h b/source/blender/editors/space_graph/graph_intern.h
index fd7fe7cc6c9..86e5451122d 100644
--- a/source/blender/editors/space_graph/graph_intern.h
+++ b/source/blender/editors/space_graph/graph_intern.h
@@ -32,6 +32,8 @@ struct bContext;
 struct wmWindowManager;
 struct bAnimContext;
 struct bAnimListElem;
+struct FCurve;
+struct FModifier;
 struct SpaceIpo;
 struct ScrArea;
 struct ARegion;