Remove the mandatory Query property from the ISystem interface,
allowing systems to manage their own queries locally or via other
means. Update all implementing systems and tests to use local
query descriptors instead.
Introduces a complete query system for iterating over entities with
specific component combinations, including support for "with" and
"without" filters.
Also adds:
- `ISystem` and `ITickedSystem` interfaces for defining logic.
- `SystemGroup` for managing and running groups of systems.
- `QueryBuilder` for a fluent API to construct queries.
- `QueryExecutor` for high-performance iteration using ref parameters.
- `Tick` and `TickType` to support timed and logical updates.
hypercross