* Restores Spell Card targetting behaviour (#73706)
## About The Pull Request
Fixes#52946
This has been broken ever since #44112 which apparently removed the proc
in this component which selected a target for performance reasons and
just... didn't replace it with anything else? So it's been bricked ever
since.
In order to restore the removed mouse tracking behaviour I implemented
the pattern used in scoped weapons and the kinesis module. As this was
the third thing I could find to use this code, I abstracted it out into
an object where most of the shared behaviour lives. I tested those
things too and they still seem to do what they used to.
Here it is in action:
https://user-images.githubusercontent.com/7483112/221954852-22244bb1-7c87-452d-a9b0-ebed81c4c1ef.mp4
Because this spell now applies a full screen overlay in order to
function, it's really begging for someone to make some touhou-style art
with cards and patterns around the edge of the screen while you are in
aiming mode, but I'm not going to be the one to make it.
I tidied this component up and refactored it as best I could while I was
reworking it to use a full screen overlay but I am... not totally
confident that it should be a component at all given that it keeps being
created and destroyed. But also it has worked that way for like four
years now, so who am I to say.
Oh yeah also the icon for this spell broke, so I fixed it.
## Why It's Good For The Game
Makes a reasonably terrible wizard spell marginally less bad.
Maybe now that this component works, some other things can use it?
If we make a fourth thing which follows your cursor it won't need to
copy/paste code around.
## Changelog
🆑
fix: Spell Cards from the Wizard spell will now home in somewhat on the
target nearest to your cursor.
fix: The Spell Cards spell now displays the correct icon instead of a
big red "error" text.
/🆑
* Restores Spell Card targetting behaviour
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Co-authored-by: Jacquerel <hnevard@gmail.com>
