Fixed accessories becoming improperly detached...

when the host suit was clicked on. It is also now clearer who has the
responsibility for attaching and removing accessories.
Accessories are now visible when attached

Uses overlays.

I was originally planning to use the SOUTH direction of the
icons/mob/ties.dmi image as the overlay, however this had problems with
the fact that those images are directional. Rather than override Move()
in clothing/under to reset dir to SOUTH whenever clothing with an
attached accessory was thrown or dragged, I thought it would be less
hacky to read the overlays from a separate .dmi.
Fixes internal storage on ground

Fixes not being able to remove items from internal storage when the
master item is on the ground.
Made drone control consoles buildable/researchable.
Allowed magnetic grippers to remove APC cells.
Added a cooldown to CLONG CLONG from moving in disposals.
Simplified robot repairs a lot for drones. No more organ damage for them.
Allowed drones to decompile dead but not gibbed clientless drones.
Added a *chirp sound for diona nymphs.
Forgot to name the drone icon when I readded it.
Merge pull request #4962 from mwerezak/internal-storage-ground-fix

Internal storage fix
Merge pull request #4963 from mwerezak/accessory-fix

Accessories
Merge pull request #4970 from Zuhayr/dev

More drone fixes.
Merge pull request #4974 from Zuhayr/dev

More more drone fixes.
Merge pull request #4975 from Zuhayr/nymphs

Added a *chirp sound clip for diona nymphs.
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into dev