+- Split the hashbrown implementation into a new module, `hashbrown`:
+ std and hashbrown can now coexist completely peacefully,
+ with `anymap::Map` being powered by `std::collections::hash_map`,
+ and `anymap::hashbrown::Map` being powered by `hashbrown::hash_map`.
+ The `raw_hash_map` alias, provided in 1.0.0-beta.1 because of the ambiguity
+ of what backed `anymap::Map`, is removed as superfluous and useless.
+ `RawMap` remains, despite not being *required*, as an ergonomic improvement.
+ With this, we’re back to proper completely additive Cargo features.
+