=ID Properties=

This commit adds supports for per-ID properties to blender.
See http://mediawiki.blender.org/index.php/BlenderDev/ID_Property
for more information on how it all works.

ID properties are accesable by python; but note that 
bindings have only been added to Object and Material thus
far.  However adding more bindings is easy and I plan
on adding several more hopefully within an hour of this inital 
commit.

A generic UI panel is also planned, that will go wherever its
needed; for example in the material buttons, editing buttons, etc.
I'll likely submit the initial code for that as a patch, though,
so matt and ton and others can go over it and make sure it's
all good. :)

VERY important, if you intend to use ID properties please
go to http://mediawiki.blender.org/index.php/BlenderDev/PropertyStandards
and start writing the appropriate standards for it.

source/blender/python/api2_2x/IDProp.h

@@ -0,0 +1,26 @@
+#include <Python.h>
+
+struct ID;
+struct IDProperty;
+struct BPy_IDGroup_Iter;
+
+typedef struct BPy_IDProperty {
+	PyObject_VAR_HEAD
+	struct ID *id;
+	struct IDProperty *prop;
+	PyObject *data_wrap;
+} BPy_IDProperty;
+
+typedef struct BPy_IDArray {
+	PyObject_VAR_HEAD
+	struct ID *id;
+	struct IDProperty *prop;
+} BPy_IDArray;
+
+typedef struct BPy_IDGroup_Iter {
+	PyObject_VAR_HEAD
+	BPy_IDProperty *group;
+	struct IDProperty *cur;
+} BPy_IDGroup_Iter;
+
+PyObject *BPy_Wrap_IDProperty(struct ID *id, struct IDProperty *prop);