This adds throw_alert() and /obj/screen/alert, a system that allows you
to do custom hud alerts for any variety of things from "You're too
cold!" to mecha status indicators for the pilot.
There's quite a few things that actually got replaced; the
fire/oxy/tox/co2 alerts are all now just alerts, as is nutrition. The
xenochimera feral indicator would probably be a good candidate for
conversion, but I didn't touch it in this PR. There's also a number of
new alerts, such as blindness, highness, legcuffed, buckled, handcuffed,
and probably some more I missed; read code/_onclick/hud/alert.dm and see
for yourself!
Additionally, a number of tweaks have been done to resisting code, to
make it so that there's an indicator when you're buckled or handcuffed,
and can just click the alert to start resisting. This includes a
refactor that combines the logic for lockers, holders, micros
escaping from shoes, and struggling in a gut all into one proc, called
container_resist(). This means that vore bellies actually no longer need
the resist override, but it's been left in place just in case someone
finds something else they want to use it for.
Also, the health and internals indicator got moved down one tile each.
Needed room for the alerts. If we add the oxygen tank action buttons
from /tg/ and remove the internals indicator, the health indicator can
go back where it was originally.
The body zone selector now indicates which body part you are about to select when hovered over, and the hover inventory indicator basically shows where you are trying to put an item, and then shows an item ghost in red or green, giving visual feedback as to if that item will go in the slot or not.
Gifs of this in action:
 Body Selection parts.

Inventory Icon Overlays!
Credit goes to @ShadowLarkens for original port to Paradise and assistance with port to Virgo. Sending to Polaris ASAP.
- A note on `code/game/objects/items/weapons/storage/internal.dm`, VSCode automatically corrected the line endings, hence the massive filediff. The only practical changes are the addition of `disable_warning = 0`
* Polaris initial plane upstream merge
* POLARIS: Fix RIG visors with new plane system, and material scanner VIS_FULLBRIGHT
* POLARIS: Fix GetFlatIcon so that cameras and id pictures don't show the HUD overlays.
* POLARIS: Adds a 'alter values' proc for plane master ease of tweaking
Setting stuff like colorblindness variety and things.
* Remove NIF reference, fix lighting layer define
* Handle effects above lighting plane
* Moved all layer defines to planes+layers.dm
* Fixed overlays that are supposed to be above lighting to use the PLANE_LIGHTING_ABOVE
* Merge: 3000% human/update_icons() speed improvement
* Merge: Avoid ghosts pointing at things
We define the inventory screen objects for hands to be special in that apply overlays to themselves for handcuffed. By putting that logic on the screen object itself, we allow it to be expanded to other cases besides handcuffs in the future without conflict.
Fixes auto blindness and no click on 510 servers, lessens the lag of
mesons and material scanners, and I suspect the general speed as well.
I only made it work for Polaris (and by extention, to our server, Eros),
and adapted it a bit.
Ported from:
7c2cc890ab
HUD positions are now relative the client view screen edges instead of absolute.
We don't currently use custom client view ranges, but this potentially makes it more reasonable to implement (an example is a new short sighted species of ours).
Port of https://github.com/d3athrow/vgstation13/pull/5984.
Updates Bump() code.
Intents now use constants.
Simple animals can now use languages without overriding say().
There is now a difference between being able to smash normal and reinforced walls.
Reworks simple_animal/attackby so that constructs don't need to override it simply to add damage resistance.
Adds ability to wear female underwear as male and vice versa.
Changes 'underwear'/'undershirt' vars to hold iconstate instead of esoteric dances with array indexes.
This should have little/no gameplay effect right now, just paving the
way for directional lights.
Replaced handle_rotation() on buckly things with this.
Signed-off-by: Mloc-Argent <colmohici@gmail.com>
First pass on major conversion of xenomorphs to a human subspecies. Additional condensing of various redundant mob verbs.
Converted larva and diona to their own class, collapsed the rest of xenomorphs into a human species, other stuff.
Completely removed attack_alien(). Still have to reimplement some of the lost behavior for human/alien.
Reapplies lost attack_alien() functionality other than tackling/caressing.
Further alien/humanoid cleanup and xenospawn fix-ups. Also uncommented caste verbs.
Removed half-finished abilities system since species.dm handles it.
All xenomorphs functionality should be working now, other than the HUD, tackling and the xenomorph balance issues.
Added icons for xenomorph castes, moved broadcast languages into datums, removed alien_talk and robot_talk vars.
Merged with organ removal code.
Reapplied verbs to simple_animals/slimes. Updated species definitions to have appropriate organs.
Readded tackle as a human verb.
Borer changes regarding brain removal.
Working on moving the human HUD to the species datum a bit. Mixed results.
Moved Cortical Link to a language, added borer husks.
Tidied up the HUD stuff. Still need to make it rebuild properly when species is changed, but this will do for no
Compile fix, forgot the DME.
Fixed up ventcrawl, added new organ mechanics for dionaea.
Fixed up some overlooked sections causing mobs without brains to die immediately.
Fixed up plasma generation for queens, bugs with organs, force_organ issues with set_species().