Random weapon API generator

Hitting /generate/weapon should respond with a random weapon data blob:

{
  'type': 'sword', // random among all weapon types
  'material': 'steel', // random among various materials
  'description': 'a sword that sparkles brightly', // randomly generated description
  'weight': '9lbs' // random weight
}

Similarly, scopes for each weapon type should respond with a random weapon (above) but guaranteed that type, with any type-specific info we want to throw in:

/generate/weapon/sword
/generate/weapon/dagger
/generate/weapon/axe
etc

Issue split from https://github.com/drusepth/Indent/issues/112

drusepth / Indent

Random weapon API generator #439