refactor: apply recursion to FilterBlock

[diogogmatos]

Refactored FilterBlock in order to completely generalize its usage and allow for the long awaited separation of "Opção UMinho" subjects from the regular ones and the organization of the subjects of each profile in the master's degree in its own category.

This refactor was made possible by using a recursive component, RenderLayer, that calls itself for each sublayer. This component receives information in the following specification, that itself is also recursive:

export interface Layer {
  title: string;
  sublayers?: Layer[];
  checkboxes?: CheckBox[];
}

The stopping condition of the recursive component is reaching a layer that has checkboxes specified. This allows us to have whatever amount of nested layers we want and even mix sublayers with checkboxes. For example, this is what the structure looks like for 1st year, 1st semester:

{
   title: "1ˢᵗ year",
   sublayers: [
     {
       title: "1ˢᵗ semester",
       checkboxes: getCheckBoxes()[0].slice(0, 5),
       sublayers: [
         {
           title: "Opção UMinho",
           checkboxes: getCheckBoxes()[0].slice(5),
         },
       ],
     },
     {
       title: "2ⁿᵈ semester",
       checkboxes: getCheckBoxes()[1],
     },
  ],
}

Notice how we have an extra sublayer on the first semester and not on the second one. This data structure gives us full liberty of what to place in the filters, what titles to give each specific layer, etc., which didn't happen before.

There were also improvements to the checkbox toggle functions so that they were generalized for events and shifts, etc.

The file went from 400 lines to just under 200 :D 🚀

Thanks to the generalization, Select All is now available for everything so we can now select all shifts of a specific subject, for example.

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[nunom27]

Good job!!