APC construction doesn't require a cell and will not pass through cell charge

[Peptide90]

Description

So APC construction has been improved but still doesn't require a power cell like it does in SS13. This is effectively the battery component of the APC and allows APCs to be upgraded in game just by swapping the cell, or to bump start a rooms power by swapping cells.

Although the construction system lets you create containers to store a cell, I'm not sure there's a way to pass through the charge percentage of the cell in proportion to the APC entity battery level, or do away with one of these things entirely so the cell charge is the battery comp for the APC.

This issue replaces #6962

[Carbonhell]

I'd say this is related to #11789 since making APCs use batteries in a cell slot instead of being batteries themself would fix this issue too by just transferring the cell to the APC cell slot on construction completed.