Jacquerel 0d5f9907a2 Shapechange health transfer tweaks (#79009) ...

## About The Pull Request

Fixes #78721
This PR does a handful of things behind the scenes to increase the
consistency of shapechange health tracking.

First of all we adjust the order of operations taken when you restore
the original body. The implementation as-was would remove the status
effect midway through and null a bunch of variables we tried to continue
using. This would result in several runtimes and code failing to run,
with the upshot that untransforming upon death would leave the caster
completely alive, with the corpse of its transformed shape at its feet.
Oops.

Additionally while testing this I realised that transferring the damagew
as also kind of fucked.
We wouldn't bother to do it at _all_ if you died, which is a shame, so I
made it simply heal you instead of reviving you so we can always do it.
Then as noted in the linked issue, we were applying all transferred
damage to a single limb, which could exceed the health of the limb and
remove damage. Now we spread it around the body.

Finally, applying damage to a human using the "force" flag would often
actually apply less damage to their _health_ than expected. This is
because arms and legs contribute only 75% of their damage taken to a
mob's overall health.
Now instead of reading `health` we read `total damage` which ignores the
limb damage modifier.

The end result of this is that if you transform into a corgi, take 50%
of your health, and transform back then you will have 50% of your health
as a human.
Previously the result would be that you'd have ~63%, then transforming
into a corgi would leave you with ~63% of a corgi's health, then
transforming back into a human would leave you at about 71%... and so on
and so forth. Now it doesn't do that.

## Changelog

🆑
fix: Dying when using (most) shapeshift spells will now kill you rather
than having you pop out of the corpse of your previous form.
fix: Damage will now be accurately carried between forms rather than
being slightly reduced upon each transformation.
/🆑

2023-10-26 01:30:53 +00:00

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