Misc. predator fixes

[Blixibon]

This PR fixes the following issues involving predators, especially gonomes:

• Predators will now only melee attack enemies within a certain Z range, which is calculated using hull height and/or the distance between the enemy's origin and eye position, depending on if the predator's target is a NPC or player. This fixes issues with predators getting stuck in a loop trying to attack enemies that are outside of its melee trace height (e.g. on displacements in the Xentarium).
• Predators won't hurthop when alert if they last saw an enemy less than 5 seconds ago. Being attacked while hunting prey also won't cause the predator to stop hunting if the attacker was the prey itself (checked by evaluating m_flLastHurtTime, which is only assigned when attacked by non-prey). This fixes gonomes getting caught in a loop while fighting citizens.
• Remove redundant functions on CNPC_Gonome which overrode CNPC_BasePredator functionality, most importantly m_nextSoundTime.
• Move CNPC_Gonome::m_poseArmsOut initialization to SetupGlobalModelData(), which is more appropriate and properly runs on save/restore.
• Fix m_nextSoundTime random value using the wrong data type.

[1upD]

I have a couple of questions about the methods removed from npc_zassassin.cpp. No changes needed but I want to make sure we tested to make sure the functionality is the same or improved

[1upD]

LGTM