moodle-booktool_wordimport

Merge pull request #27 from Menrath/issue-23

fix: define xsltparameters property in wordconverter class

Support export of img/@alt attribute, not img/@longdesc (Dustin Jeffery); only require Moodle 3.9

Use img/@alt instead of img/@longdesc (Dustin Jeffery), require Moodle 3.9

Merge Dustin Jeffery fix for using alt instead of longdesc in image elements, relax Moodle version requirement back to 3.9