Adding a 'lock' action for timetable

[o-ohst]

Is your feature request related to a problem? Please describe.

Sometimes when planning modules on the timetable, the colors can be a bit distracting and it is hard to focus on the mods that I am trying to plan or shift.

Describe the solution you'd like

Add a 'lock' button. Upon clicking it, the user may click on different slots so that they become grey and hence locked. Click again to unlock. The locked slots become fixed and gray afterwards, to allow the user to focus on the slots he/she wants to shift.

Describe alternatives you've considered

Adding a 'hide' option for not just the mods, but also the different type of lessons (LEC, TUT, REC etc.) separately.

[ylyma]

i’ll take this