[MERGED PR] First aid kits no longer get health analyzers

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About the PR
Replaces the health analyzers in common first aid kits (regular, brute, fire, toxin, oxygen, brain) with items suitable for treatment or diagnosis of the condition

Here are the replacements for health analyzers per first aid kit type:
Regular: bandage, for bleeding
Brute: saline injector, for blood loss
Fire: medicated bandage, since they heal burns
Toxin: calomel injector, for toxin purging
Oxygen: stethoscope, for diagnosis
Brain: pen light, for diagnosis

Other first aid kits, such as emergency, dusty, and the various vr kits still contain health analyzers.

Also makes some additional supporting tweaks:
* Aid contracts will roll for stethoscopes and pen lights before health analyzers, and require less health analyzers
* Minimeds are stocked with a few more health analyzers, at a slightly more expensive price
* Replaces a chain of status checks with `can_act` for stethoscopes

Why's this needed?
First aid kits that contain health scanners are available all over the station. Health scanners tell you the exact amount of damage you have for each damage type, as well a variety of stats like diseases, radiation levels, blood pressure, etc. currently affecting you. This has some negative effects for antagonist actions like posions since they are easily detectable. This also reduces the benefits of having doctors on station and available.

Note that you can still examine someone, including yourself, to get a general idea of brute/burn damage, and use a first aid kit to patch yourself up based on that. In addition, health implants still give you solid insight into the damage types that are afflicting you.

Changelog

Code:

changelog
(u)glowbold
(*)Common first aid kits do not contain health analyzers, but have more apt supplies for the damage type they're associated with.

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