Update XULRunner version and submodule
Update submodule
Update application.ini
Update version info on update

Closes #20
Use separate version number for determining which Word plugin to keep
Update submodule
Update word processor plugins
Update submodule
Update submodules
Use XULRunner 19
Update submodule
Remove more old zoteroWinWordIntegration dlls
Workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=843428
Build against Zotero 3.1