edje_entry: fix some preediting bugs
- Attributes can come with random sequence. So, attribute list should be sorted based on start_index.
- None tag can be used for some languages' preediting. So, the tag also needs to be handled the same with other tags.
Reviewed-by: Marcel Hollerbach <firstname.lastname@example.org>
Differential Revision: https://phab.enlightenment.org/D11059