AnimEditors: Draw start/end frame ranges on all timelines by default

This uses the global scene range, with styling matching the sequencer's start/end
frame drawing.

(The graph editor's "drivers" mode is exempt, as that doesn't really display time
in a linear way, so the start/end frames don't apply)

source/blender/editors/include/ED_anim_api.h

@@ -551,6 +551,12 @@ void ANIM_draw_cfra(const struct bContext *C, struct View2D *v2d, short flag);
 /* main call to draw preview range curtains */
 void ANIM_draw_previewrange(const struct bContext *C, struct View2D *v2d, int end_frame_width);
 
+
+/* -------------- Frame Range Drawing --------------- */
+
+/* main call to draw normal frame range indicators */
+void ANIM_draw_framerange(struct Scene *scene, struct View2D *v2d);
+
 /* ************************************************* */
 /* F-MODIFIER TOOLS */