Query syntax revamp, perf improvements

[0ffz]

• Use separate objects to define query types, then builder syntax for runners
• Support anonymous objects nicely in the new syntax
• Disallow modifications while iterating, (still possible via unsafeEntity but no longer supported by accessors)
  • Preferred alternative is the new defer { ... }.onComplete { ... } syntax for systems, listeners still allow live modifications
  • This simplifies some internal code and removes the need for things like removable
• Performance improvements for iteration speed by switching up how accessors do their caching, as well as from simpler code disallowing modifications on iteration.
• Update/reimplement some old tests (ex. for .map .orDefault) accessors
• Update all addons, tests, and benchmarks to use the new syntax