Merge remote-tracking branch 'origin/3.2'

1. Conflicts:
2. src/migration/mdb/src/keximdb/keximigrate_mdb.json
3. src/migration/mysql/keximigrate_mysql.json
4. src/migration/postgresql/keximigrate_postgresql.json
5. src/migration/tsv/keximigrate_tsv.json
6. src/plugins/forms/widgets/main/kexiforms_mainwidgetsplugin.json
7. src/plugins/forms/widgets/webbrowser/kexiforms_webbrowserwidgetplugin.json