Add a repeating container

[ericscheid]

Drag/drop a "repeating container" onto the charsheet. Drag to resize. Click a widget to set how many repeats downwards.

Then, when any other block is dragged into that master row, it lands in that master row and gets auto-repeated into the extra rows. Any edits to the master row propogate to the repeats.

For example: a weapons table, with each row having a box for weapon name, damage, type, range, etc.

[5e-Cleric]

To clarify about how this might work, we need to create a html element modifiable by the user, and import that as a draggable item in builderPage.jsx.

This item should be stored in the sheets db, so we shall construct that functionality first.