This PR contains bugfixes for:
Drones being unable to matter-decompile burnt matches (#717). Burnt matches will be decompiled into a small amount of wood.
Ghosts triggering infrared emitters (#644). Added a check whether the movable passing through the laser beam is actually "visible".
Reagent transfer messages showing up when clicking on chem implant cases, even when the syringe is empty (#704). Added a check whether reagents have actually been transferred. The displayed message will now also display the actual amount transferred. Removed spawn(5)-delay to prevent click-stacking.
Limb relocation messages not showing up for bystanders (#778).
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