RNA Fixes

* Python apis iterator didnt work, for example [f for f in mesh.faces] # failed.
* Python apis collection.items(), collections without names now return (index,value) pairs, better then returning nothing.
* bpy.ui and bpy.props modules were incorrectly named
* Mesh vertex colors red/blue needed to be swapped on getting/setting.
* Mesh vertex colors were not clamped.

source/blender/python/intern/bpy_ui.c

@@ -373,7 +373,7 @@ static struct PyMethodDef ui_methods[] = {
 #if PY_VERSION_HEX >= 0x03000000
 static struct PyModuleDef ui_module = {
 	PyModuleDef_HEAD_INIT,
-	"bpyui",
+	"bpy.ui",
 	"",
 	-1,/* multiple "initialization" just copies the module dict. */
 	ui_methods,