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.
Fixes the undefined icon resulting in this:
Fixes the two buttons being misaligned with the UI.
Fixes double-clicking inside the AI PiP room teleporting the AI Eye out to the room and completely breaking the view. Do note that double-clicking no longer works at all inside the multi-cam room, as a tradeoff for completely preventing UI breaks.
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`
- Port based on Baystation's implementation and customized for our code and usages.
- Switched space icon_state permutation to a "dust" overlay that is permutated the same way. As an overlay, the dust can be *above* the parallax planes. Space turfs are now white to allow skybox to BLEND_MULTIPLY onto them.
- Added skybox hud effect that replaces background space turfs with an image moved to create a parallax effect.
- Added skybox subsystem to generate and manage skybox parallax images, and lots of images for it!
