Added back importing UI scripts rather then running,

The bug was todo with bpy.data and bpy.types becoming invalid, temporary fix is to re-assign them to the bpy module before running python operators or panels.
will look into a nicer way to get this working.

source/blender/python/intern/bpy_util.h

@@ -67,4 +67,7 @@ int BPY_class_validate(const char *class_type, PyObject *class, PyObject *base_c
 
 char *BPy_enum_as_string(struct EnumPropertyItem *item);
 
+
+#define BLANK_PYTHON_TYPE {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
+
 #endif