[Xedra Evolved] fix spells, that give temp limbs, take two

[GuardianDll]

Summary

None

Purpose of change

It was revealed for me that previous fix #69298 was only a partial success, since effects was not able to remove itself in the end

Describe the solution

Change the spell again, now it is a toggleable spell that consume flat amount of mana, and recast itself each spell length time
To prevent player from giving their mana and time to cast a spell when turning off, new u_has_trait math function is used, made by Andrei8l (thank you again!)

Testing

Mutation is given to player, limbs appear and disappear as expected
I didn't compile the game to test new math function yet, will do it tomorrow-ish compiled the game, tested new math effect, looks good