[Bug] Casters constantly Manastoning through Invis application

[r33kgr3yj0y]

Makes invising anywhere extremely tedious. E3legacy, once detected invis, it ceased actions instantly, never breaking invis.

[RekkasGit]

I've added yet another invs check in the manastone code, as well as adding interrupt to spell casting in general if it detects invs. working on testing

[RekkasGit]

In master, try and replicate please.