Move drawing functions from shell-global into new shell-drawing.c file

Just to avoid shell-global.c bloat.

src/shell-global.h

@@ -71,28 +71,12 @@ void     shell_global_ungrab_keyboard (ShellGlobal *global);
 
 void shell_global_reexec_self (ShellGlobal *global);
 
-ClutterCairoTexture *shell_global_create_vertical_gradient (ClutterColor *top,
-							    ClutterColor *bottom);
-
-ClutterCairoTexture *shell_global_create_horizontal_gradient (ClutterColor *left,
-							      ClutterColor *right);
-
 void shell_global_format_time_relative_pretty (ShellGlobal *global, guint delta, char **text, guint *update_time);
 
 ClutterActor *shell_global_create_root_pixmap_actor (ShellGlobal *global);
 
 guint shell_global_get_max_word_width (ShellGlobal *global, ClutterActor *ref, const char *text, const char *font);
 
-void shell_global_clutter_cairo_texture_draw_clock (ClutterCairoTexture *texture,
-						    int                  hour,
-						    int                  minute);
-
-void shell_global_clutter_cairo_texture_draw_glow (ClutterCairoTexture *texture,
-                                                   double red,
-                                                   double blue,
-                                                   double green,
-                                                   double alpha);
-
 G_END_DECLS
 
 #endif /* __SHELL_GLOBAL_H__ */