Ancient Warfare 2

New mailbox textures.
Updated some of the structures to fix some rotation issues and make them smaller.

Removed code that made elite NPCs standing for player worse than the rest of the types in the given faction.
Added logic to not export extra air layers above structures during scanning.
Changed player owned combat units to only pick up weapons if they don't have anything in hand or if the item on the ground is a better version of what they have in hand.
AW boats now don't get stuck on lily pads anymore and break them instead.
Updated GoG entities in player owned npcs targeting list - removed neutral ones, added some missing hostile
Added catching and logging exceptions when tile entity is placed in the world from template so that if other mods change these we don't outright crash.
When players or npcs controlling vehicles sit they have a smaller bounding box now.

Fixed issue with npcs attacking through walls
Fixed issue with research not syncing to client in single player.
Fixed check that prevents non river structures from being built into rivers.
Fixed faction unit's horses to correctly get AI reset when their rider gets killed
Made vines rule reuse block state properly and not spam duplicate entries all over the exported files.
Fixed structure placement so that too close structures don't ruin the other with their border clearing.
Fixed placing boats on water
Fixed scanning and building rails with proper rotation