Idea: wall integrated turrets

[Mackowatosc]

In essence, the idea is that turrets integrate well into walls graphically, just as walls connect to other walls / gates gracefully.

Side idea: give turrets ability to report ammo counts to the network (at least bob's sniper turrets appear to not be connectable?)

[bobingabout]

Bob's sniper turret isn't the best starting point for testing. The entity uses hand-written code that pre-dates many entities having network connections, so it may not have been updated to include a network connection if the base game entities were.