[sharing] Delete directly a "string/symbol" in umenu.

I was always a little annoyed that something like "delete string" (delete the symbol / string entry by its name) does not work with the umenu. I always wondered why it does not exist directly as a function. anyways ..
Somewhen I woke up and I finally got the redemption!

Conlusion: in Max everything is possible, you just have to use your brain.