minor changes to Martni's commit 30961

- removed the immediate option from C/api and now store in python only, when python loads modules it sets it to False.
- unloading a module would clear the entire TypeMap for all modules, only remove the module types that is being unloaded.
- added some checks for bad class registering, report errors rather then crashing.

source/blender/python/intern/bpy_rna.h

@@ -86,8 +86,6 @@ int pyrna_set_to_enum_bitfield(EnumPropertyItem *items, PyObject *value, int *r_
 
 int pyrna_enum_value_from_id(EnumPropertyItem *item, const char *identifier, int *value, const char *error_prefix);
 
-void bpy_set_immediate_register(int value);
-
 int pyrna_deferred_register_props(struct StructRNA *srna, PyObject *class_dict);
 
 /* called before stopping python */