Partially hidden modules

[Kurtyjlee]

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

It would be good to have partially hidden modules so that lectures/recitations can be hidden, when it is either not relevant (due to TA) or students do not wish to attend.

Describe the solution you'd like

Have an option to hide individual components of the module or an option to only show certain parts of the module.

Describe alternatives you've considered

An alternative would be giving users can option to add custom modules with their own custom timings and labels. This might be useful for DYOM mods as well if users want to set aside a portion of their week to complete the DYOM mod.

[EssWhyy]

Seems like #3483 partially addresses this, to hide single timeslot blocks. Will see if if I can extend and refine further.