slide-rs / specs / 748
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bors[bot] 
Merge #275

275: Add an ability to save and load entities. r=torkleyy a=omni-viral

Add (de)serialization support for entities to specs.
Main parts are:
* `Marker` trait.
`Marker` is used for several purposes:
  * Mark which entities should be serialized.
  * It contains ID to replace `Entity` stored in `Component`s during serialization process.
  * It may contain additional data to be used for tracking owner of the component.
* `MarkerAllocator` trait for allocating `Marker`s, storing `Marker -> Entity` mapping and other stuff.
* `SerializableComponent` trait that is auto implemented by components if they implements `Serialize`, `DeserializeOwned` and `Copy` (later is rather strict, maybe it should be replaced with `Clone` or removed somehow).
Mainly `Component` implements `SerializableComponent` manually when it contains `Entity`.
`Component` should replace `Entity` with provided `Marker` in `SerializableComponent::save` function. And replace `Marker` with `Entity` in `SerializableComponent::load` function.
* `Components` trait is implemented for tuples of `SerializableComponent`s
It allows to save all existing and mentioned in tuple components of one entity from `ReadStorage`s into serializable structure. And load it into `WriteStorage`s again.

Helper types `WorldSerialize` and `WorldDeserialize` are good example how to use this facility.

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ID Job ID Ran Files Coverage
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 Travis Job 748.2
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