2.5: Space Image ported back

Organized as follows:

uvedit/
	uv editing related code
	uvedit_draw.c: drawing code
	uvedit_ops.c: operators, just a few done
	uvedit_unwrap_ops.c: will be operators for unwrapping
	uvedit_paramatrizer.c: lscm/abf/stretch/pack

space_image/
	space_image.c: registration and common getter/setters
	image_draw.c: drawing code, mostly functional
	image_panels.c: panels, all commented out
	image_render.c: render callbacks, non functional
	image_ops.c: operators, only view navigation done
	image_header.c: header, menus mostly done but missing buttons

Notes:
* Header menus consist only of Operator and RNA buttons, if they
  are not implemented they're displayed grayed out. Ideally the full
  header could work like this, but std_libbuttons looks problematic.

* Started using view2d code more than the old code, but for now it
  still does own view2d management due to some very specific
  requirements that the image window has. The drawing code however
  is more clear hopefully, it only uses view2d, and there is no
  switching between 'p' and 'f' view2d's anymore, it is always 'f'.

* In order to make uvedit operators more independent I move some
  image space settings to scene toolsettings, and the current image
  and its buffer is in the context. Especially sync selection and
  select mode belonged there anyway as this cannot work correct with
  different spaces having different settings anyway.

* Image paint is not back yet, did not want to put that together with
  uvedit because there's really no code sharing.. perhaps vertex paint,
  image paint and sculpt would be good to have in one module to share
  brush code, partial redraw, etc better.

source/blender/editors/include/ED_mesh.h

@@ -42,6 +42,11 @@ struct ViewContext;
 struct bDeformGroup;
 struct MDeformWeight;
 struct MDeformVert;
+struct Scene;
+struct MCol;
+struct UvVertMap;
+struct UvMapVert;
+struct CustomData;
 
 // edge and face flag both
 #define EM_FGON		2
@@ -79,9 +84,9 @@ void		ED_keymap_mesh(struct wmWindowManager *wm);
 void		ED_spacetypes_init(void);
 void		ED_keymap_mesh(struct wmWindowManager *wm);
 
-void		make_editMesh(Scene *scene, Object *ob);
-void		load_editMesh(Scene *scene, Object *ob);
-void		remake_editMesh(Scene *scene, Object *ob);
+void		make_editMesh(struct Scene *scene, Object *ob);
+void		load_editMesh(struct Scene *scene, Object *ob);
+void		remake_editMesh(struct Scene *scene, Object *ob);
 void		free_editMesh(struct EditMesh *em);
 
 void		recalc_editnormals(struct EditMesh *em);
@@ -100,8 +105,12 @@ void		undo_push_mesh(struct bContext *C, char *name);
 /* editmesh_lib.c */
 
 struct EditFace	*EM_get_actFace(struct EditMesh *em, int sloppy);
+void             EM_set_actFace(struct EditMesh *em, struct EditFace *efa);
+float            EM_face_area(struct EditFace *efa);
+void             EM_add_data_layer(struct EditMesh *em, struct CustomData *data, int type);
 
 void		EM_select_edge(struct EditEdge *eed, int sel);
+void		EM_select_face(struct EditFace *efa, int sel);
 void		EM_select_face_fgon(struct EditMesh *em, struct EditFace *efa, int val);
 void		EM_selectmode_flush(struct EditMesh *em);
 void		EM_deselect_flush(struct EditMesh *em);
@@ -114,6 +123,9 @@ int			EM_get_actSelection(struct EditMesh *em, struct EditSelection *ese);
 void		EM_editselection_normal(float *normal, struct EditSelection *ese);
 void		EM_editselection_plane(float *plane, struct EditSelection *ese);
 
+struct UvVertMap *EM_make_uv_vert_map(struct EditMesh *em, int selected, int do_face_idx_array, float *limit);
+struct UvMapVert *EM_get_uv_map_vert(struct UvVertMap *vmap, unsigned int v);
+void              EM_free_uv_vert_map(struct UvVertMap *vmap);
 
 /* editmesh_mods.c */
 extern unsigned int em_vertoffs, em_solidoffs, em_wireoffs;
@@ -125,6 +137,9 @@ void		EM_free_backbuf(void);
 int			EM_init_backbuf_border(struct ViewContext *vc, short xmin, short ymin, short xmax, short ymax);
 int			EM_init_backbuf_circle(struct ViewContext *vc, short xs, short ys, short rads);
 
+/* editface.c */
+struct MTFace	*EM_get_active_mtface(struct EditMesh *em, struct EditFace **act_efa, struct MCol **mcol, int sloppy);
+
 /* editdeform.c XXX rename functions? */
 
 #define WEIGHT_REPLACE 1