Update space dispatch:

- drawXXXspace, changeXXXspace, and winqreadXXXspace now receive the area
     and spacedata as explicit arguments, allowing them to access private
     data w/o going through globals.
 - pass the new BWinEvent through to the winqreadXXXspace, allowing future
     access to extended event data.

Removed direct calls to winqreadXXXspace to simulate user actions, replaced
by calls to action functions in edit.c or the appropriate handler.

source/blender/include/BSE_drawipo.h

@@ -41,6 +41,7 @@
 #define SELECT_SUBTRACT  4
 #define SELECT_INVERT   16
 
+struct ScrArea;
 struct EditIpo;
 struct View2D;
 struct rctf;
@@ -52,12 +53,13 @@ void areamouseco_to_ipoco	(struct View2D *v2d, short *mval, float *x, float *y);
 void ipoco_to_areaco		(struct View2D *v2d, float *vec, short *mval);
 void ipoco_to_areaco_noclip	(struct View2D *v2d, float *vec, short *mval);
 
+void view2d_zoom			(struct View2D *v2d, float factor, int winx, int winy);
 void test_view2d			(struct View2D *v2d, int winx, int winy);
 void calc_scrollrcts		(struct View2D *v2d, int winx, int winy);
 
 int in_ipo_buttons(void);
 void drawscroll(int disptype);
-void drawipospace(void);
+void drawipospace(struct ScrArea *sa, void *spacedata);
 
 void center_currframe(void);
 void scroll_ipobuts(void);