Fast lesson creation on time based timetable

[friendly424]

General Troubleshooting

• [x] I have checked for similar issues.
• [x] I have updated to the latest version.
• [x] I have checked the branches or the maintainers' PRs for upcoming features.

Feature Request

It would make sense to add the possibility to fast add lessons to timetable with click on a empty slot, same as in non time based timetable.