Add phys damage additional effect procs, add priority additional effects, scripted additional effects, add excalibur (75-119 III) add effect

[WinterSolstice8]

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• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
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• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Bunch of stuff but basically
We needed priority add effect support for Excalibur, and the add effect mods couldn't cut it too well for this edge case so I added scripting support

Fixed add effects not dealing damage or healing (kill me)

Closes #4378

Steps to test these changes

die in front of the keyboard after testing stuff and realizing damage/healing wasn't being dealt (but now is)

[WinterSolstice8]

Excalibur proc msg source:

https://youtu.be/I9lN2ixnzck
https://drive.google.com/drive/folders/1f-fhr-m3uhh1msjiwOxOcEaoDqrNvd_w?usp=drive_link

7% rate source (I have seen no data, just numbers)
https://wiki.ffo.jp/html/1479.html

[Xaver-DaRed]

I think we should in the long run default to the script

But on the long run, not now