Update version and readme for the 1.3 release.
Merge branch 'master' of https://github.com/moodleou/moodle-qtype_ddimageortext
Fix use of deprecated context functions.

Also, improve import to use new qformat_xml method.
Merge branch 'master' of https://github.com/moodleou/moodle-qtype_ddimageortext