Aura rework into mob modifiers.

[MistakeNot4892]

Description of changes

• Removes /obj/aura.
• Adds /decl/mob_modifier and /datum/mob_modifier as well as vars and procs to track them on /mob/living.
• Sets/clears a modifier on the HUD when prone or restrained/buckled.
• Converts existing auras into modifiers.

https://cdn.discordapp.com/attachments/808112536082841631/1332947606556512286/aFFNpHSmc8.mp4?ex=67971bb2&is=6795ca32&hm=fc578a36349046c99895ad8dd77bf4bde96dad289601fa35f62d06d731feab82&

TODO

• Add basic structure and HUD elements for modifiers.
• Track the same modifier coming from multiple sources.
• Convert drake aura to modifier.
• Convert personal shields to modifiers.
• Convert regeneration aura to modifier.
• Convert radiant aura to modifier.
• Convert nanoswarm to modifier.
• Convert rings to use item effects.
• Convert aura item effect to use a modifier.
• Convert mech shields to a modifier.
• Convert mech ballistic shields to a modifier.
• Convert cloaking to use a modifier.
• Convert stasis to use a modifier.
• Integrate the main modifier element with /datum/hud
• Make HUD marker take a basic icon from the HUD style decl and use overlays.
• Debounce or otherwise fix up position/offsets for HUD markers.
• Get a better icon for the prone modifier.
• Get status condition modifiers to work.
• Add any additional modifiers that could use a tooltip (druggy, dizzy, etc?)
• See how the new modifiers work with abilities, maybe lower the default ability screen_loc by one tile.

Final shakedown testing

• Retest light aura
• Retest radiant aura
• Retest personal shields
• Retest nanoswarm augment
• Retest drake sifsap aura
• Retest regeneration aura
• Retest mech shields
• Retest stasis
• Retest cloaking

Why and what will this PR improve

Makes auras/status more obvious and provides immediate information about them via tooltip.
Removes objects (and hence verb refreshes and such) from the concept of a duration status condition.

Authorship

Myself. Basic idea is from Polaris though.

Changelog

🆑
tweak: Modifiers like regeneration or personal shielding will now show at the top of the screen.
/:cl: