* improves SM cascade performances and fixes announcement text (#67240)
Changes the cascade walls from turfs to objects to improve the performances of the roundending cascade.
The issue was that ChangeTurf() was a pretty expensive proc to be called that many times so i moved the cascade wall into an object. It doesn't delete anything other than living mobs and the portal to prevent edge case runtimes.
Plus remove a span_bold() from the announcement text since it wasn't making the text bold but was leaving behind
* improves SM cascade performances and fixes announcement text
Co-authored-by: Ghilker <42839747+Ghilker@users.noreply.github.com>
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