Npc set state time + Zenlib fixes

[markusobi]

• implemented external Npc_SetStateTime. In example: Vatras will now make a short pause between his preaches
• Zenlib: added and registered all missing (Gothic-2-only-)data members of engine classes (C_Classes).
• Zenlib: fixed invalid member registering for the wrong VMs (Particle, Menu, Gothic). Menu classes no longer registered in non Menu-VMs and vice versa.
• Zenlib: fixed incorrect registering of aivar array. This means script functions using the aivar array should work now. In example the Lefty-water quest can now be completed. (though Lefty still is on invalid position and must be teleported to the hero via tp Lefty PC_HERO). Also Vatras now tells the full story instead of the first talk over and over again. TODO: Fix: Vatras' monolog interferes with the player's dialog.
• Zenlib: unifed array accesses for registered members (float, int, string).
• Zenlib: added Log-Warning for array out of bounds check for registered data members (scalar/arrays)
• Zenlib: added pedantic log-warnings for invalid script operations in the Daedalus VM.
• fixed incorrect popping operation of item instance in npc_getdisttoitem
• added handle validation check in getItemByInstance

[markusobi]

This pull will make REGoth crash when trying to load saves prior to this version, because the aivar array was named incorrectly (ai)