Add additional NULL checks all around the code before dereferencing GetVictim() result.
Keep in mind UpdateVictim() result has nothing to do with GetVictim() result and the caller shouldn't assume anything about GetVictim() based on UpdateVictim().
Add a new method EnsureVictim() which asserts a valid not NULL reference will be returned to the caller. Use this whenever the GetVictim() would be dereferenced .
Prevents fleeing or feared units from going to upper floor ignoring walls/ceilings with mmaps on(and usually get stucked).
Current implementation just randomly selects a distance and angle against the frighting unit, when in narrow circumstance such as underground caves, such targeting point would be at another floor.
Closes#11300
Ref #9475 (needs fixed confirmation)
* Moved everything into one specialized method instead of being scattered all over the place
* Allow localizing creature names in chat messages (when using $N)
* Send SMSG_GM_MESSAGECHAT for gm messages
