Quickfixes to combat.as. Especially kitsune.

Because kitsune.

* Quickfix for kitsuneIllusion. Now properly caps at -20; no more -50 speed. Simplified check roll.
* Quickfix for Urta tease 42. No more Urta abuse... impersonation!
* Quickfeature für Isi accent check in combat. (Should this be in a separate pull request as it might not be seen as a fix?)

* KITSUNE NOTE: No changes done on lustVuln effect but requires attention from the special attack author. Is Illusion really supposed to increase lust vulnerability by 10% *only* if target's lust vulnerability is 110% or more (very unlikely), or is it intended to be "at least 10%" (should be 0.1 instead of 1.1) or "below 110%" (should be below 1.1 but still check for more than 0 to prevent it from becoming OP)?

*Play with fire note: Might want to keep a separate fire effect function to prevent redundant calls and possibly forget to call some NPCs and monsters, especially if more weak/strong/immune to fire instances are implemented. Maybe if time?