various utf8 compatibility fixes

- OBJ import/export now work with non utf8 paths. (all exporters and importers need changes like this)
- strip non utf8 chars from new ID blocks (also applies to renaming)
- set the file rename button to allow non-utf8 chars.

release/scripts/io/import_scene_obj.py

@@ -892,7 +892,7 @@ def load_obj(filepath,
     This function passes the file and sends the data off
         to be split into objects and then converted into mesh objects
     '''
-    print('\nimporting obj "%s"' % filepath)
+    print('\nimporting obj %r' % filepath)
 
     if SPLIT_OBJECTS or SPLIT_GROUPS or SPLIT_MATERIALS:
         POLYGROUPS = False
@@ -935,7 +935,7 @@ def load_obj(filepath,
     # so we need to know weather
     context_multi_line= ''
 
-    print('\tparsing obj file "%s"...' % filepath)
+    print("\tparsing obj file...")
     time_sub= time.time()
 # 	time_sub= sys.time()
 
@@ -1220,7 +1220,7 @@ def load_obj(filepath,
 # 	time_new= sys.time()
 
     print('%.4f sec' % (time_new-time_sub))
-    print('finished importing: "%s" in %.4f sec.' % (filepath, (time_new-time_main)))
+    print('finished importing: %r in %.4f sec.' % (filepath, (time_new-time_main)))
 
 
 DEBUG= True
@@ -1467,7 +1467,7 @@ class IMPORT_OT_obj(bpy.types.Operator):
     # to the class instance from the operator settings before calling.
 
 
-    filepath = StringProperty(name="File Path", description="Filepath used for importing the OBJ file", maxlen= 1024, default= "")
+    filepath = StringProperty(name="File Path", description="Filepath used for importing the OBJ file", maxlen= 1024, default= "", subtype='FILE_PATH')
 
     CREATE_SMOOTH_GROUPS = BoolProperty(name="Smooth Groups", description="Surround smooth groups by sharp edges", default= True)
     CREATE_FGONS = BoolProperty(name="NGons as FGons", description="Import faces with more then 4 verts as fgons", default= True)