Refactored the entity system to be **property-driven** with automatic `On<Property>` change handlers.
Added improved `Bridge.Entity.SetOnCreate` support so clients can identify and attach logic to **server-created entities** based on properties.
Introduced standardized default properties on `Bridge.Entity.Create`, including:
* `freeze` (defaults to frozen)
* `invincible`
* `targets`
* `attach`
* `anim`
Added exported helper functions for all of the above to allow runtime updates after creation.
Mr.Crowley
68ca928033