[Feature] [Breakdown] Add ability to export breakdown sheets

[hyuri]

The option Starc offers right now of exporting all breakdown elements as a spreadsheet is really awesome, useful and a time-saver.

But the ability to export breakdown sheets for all the scenes would be truly wonderful and another massive time-saver as well.

For reference, he's an example of a typical script breakdown sheet:

Source: https://www.studiobinder.com/blog/downloads/script-breakdown-sheet-template/

Even better if we can customize the breakdown sheet template — add and remove sections, for example — like we can customize the screenplay Cover/Title Page, and if we can also have an option to export a list/legend of the categories and associated colors, to provide an easy reference for other crew members.

[dimkanovikov]

this one is planned when we'll work on the scheduling module