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_editaction.h

@@ -48,7 +48,7 @@ void set_action_key (struct bAction *act, struct bPoseChannel *chan, int adrcode
 struct bAction *add_empty_action(void);
 void deselect_actionchannel_keys (struct bAction *act, int test);
 void deselect_actionchannels (struct bAction *act, int test);
-void winqreadactionspace(unsigned short event, short val, char ascii);
+void winqreadactionspace(struct ScrArea *sa, void *spacedata, struct BWinEvent *evt);
 void remake_action_ipos(struct bAction *act);
 void select_actionchannel_by_name (struct bAction *act, char *name, int select);
 struct bAction *bake_action_with_client (struct bAction *act, struct Object *arm, float tolerance);