This PR is a .md version of DVD's google doc on weapon organization.

I'll let DVD edit this header post if he wants to give a rundown in his words:

The idea here is to make a "default roster" that most of these forks won't use. The intention is to work off of a minimal base composing of the basic entities anyone who has played a Wizden server knows and loves, as well as just a few entries that show basic weapon archetypes, as well as "proof of concepts" that make use of tech and tools that has been made for gun entities (which is why the Anaconda is there, and why the Echion weapons are included). I think of the role this roster provides as being a sort of Game Maker Example Game-- gives you a taste of what these entities can do, what a future downstream might like or dislike, and allow them to springboard off of these from there.

As for the final organization and how the .yml's are laid out, I fully intend to eschue Wizden's file formatting in favour of what I put together for the _Impstation directory back on our fork. I have separate .yml's for the base entities, as well as having archetypes broken up into separate .yml's themselves, either by ammo type or source (whatever makes sense for the weapon. The format would go as follows:

Ammunition -- boxes, cartridges, and magazines. NO projectiles, just everything to do with ammo itself.
Blasters -- projectile-based energy weapons
Disablers -- stun-based energy weapons
Fuel Guns -- anything that uses reagents or even gasses as ammunition.
Lasers -- hitscan-based energy weapons
Launchers -- storage-weapons, bazookas, grenade launchers
Machine Guns -- SMGs, LMGs, miniguns. I lumped these all together for ease of understand for non-gun folks, and because the latter two categories lack enough entries for their own folders.
Pistols -- Like it says on the tin
Projectiles -- EVERYTHING projectiles; sub-folders are Bullets, Effects (muzzle flashes/impacts), Energy, Launchers, Special.
Revolvers -- if it has a revolving cylinder it goes here
Rifles -- Assault rifles and DMRs would go here.
Shotguns -- Like it says on the tin
Snipers -- Yeah
Special -- Anything really exotic or obtuse that doesn't quite fit elsewhere (grapplers, force/tether guns, tesla gun). Admeme guns go here as well.

Included in this PR: i also just copied over the wizden feature proposal template