`bevy_reflect` reorganized to de-clutter the crate root

bevy_reflect has undergone a large reorganization. Many modules have been exposed in the crate root, each containing items relevant to their "kind" of reflected type:

• array
• enums
• list
• map
• set
• structs
• tuple
• tuple_struct

For example, the structs module now contains the Struct trait, as well as related items like DynamicStruct or StructInfo.

This change was made to de-clutter the crate root of bevy_reflect, hopefully making it easier to find what traits and types you need for your use of reflection.

Migrating should only require editing your use statements. The Rust compiler will give hints at the new type paths, should you need any assistance.