* remove squad support and switch to using pipelines only in RulesBuilder
* remove spawn_food.standard from legacy ruleset definitions
* bugfix: Royale map generates Standard food
* add maps support to CLI
* add automated tests for all registered GameMap implementations
* update README
- Update usage section in the README with the latest flags.
- Update default sample output (BoardState fields have changed,
OutOfBounds has been removed).
- Add section describing options for getting JSON output with the
`--output` and `--debug-requests` flag.