Use fnv instead of ahash.

[Anders429]

Resolves #86. This reduces the dependency tree quite a bit, since randomness is not actually needed. All of the hashing is done internally, unrelated to user input, so HashDoS attacks are not a concern. See #86 for more details on the reasoning behind this.

[codecov-commenter]

Codecov Report

Merging #87 (1743c30) into master (65ace8e) will decrease coverage by 0.03%.
The diff coverage is 27.65%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   39.97%   39.94%   -0.04%     
==========================================
  Files          56       56              
  Lines        5973     5970       -3     
==========================================
- Hits         2388     2385       -3     
  Misses       3585     3585              

Impacted Files	Coverage Δ
src/entities/seal/storage.rs	0.00% <0.00%> (ø)
src/entity/seal/storage.rs	0.00% <0.00%> (ø)
src/query/claim.rs	0.00% <0.00%> (ø)
src/query/filter/seal.rs	0.00% <0.00%> (ø)
src/query/result/iter.rs	0.00% <0.00%> (ø)
src/query/result/par_iter.rs	0.00% <0.00%> (ø)
src/query/view/par/seal/mod.rs	0.00% <0.00%> (ø)
src/query/view/seal.rs	0.00% <0.00%> (ø)
src/system/schedule/builder.rs	0.00% <0.00%> (ø)
src/system/schedule/raw_task/seal.rs	0.00% <0.00%> (ø)
... and 7 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[Anders429]

Everything looks good here. I ran ecs_bench_suite and found a few performance improvements (simple_insert, fragmented_iter, add_remove_component, serialize_text, and serialize_binary all saw improvements). The size of the dependency tree is reduced a bit, looking like this:

$ cargo tree
brood v0.1.0
├── either v1.7.0
├── fnv v1.0.7
└── hashbrown v0.12.3

and

$ cargo tree --all-features
brood v0.1.0
├── either v1.7.0
├── fnv v1.0.7
├── hashbrown v0.12.3
│   └── rayon v1.5.3
│       ├── crossbeam-deque v0.8.1
│       │   ├── cfg-if v1.0.0
│       │   ├── crossbeam-epoch v0.9.9
│       │   │   ├── cfg-if v1.0.0
│       │   │   ├── crossbeam-utils v0.8.10
│       │   │   │   ├── cfg-if v1.0.0
│       │   │   │   └── once_cell v1.12.1
│       │   │   ├── memoffset v0.6.5
│       │   │   │   [build-dependencies]
│       │   │   │   └── autocfg v1.0.1
│       │   │   ├── once_cell v1.12.1
│       │   │   └── scopeguard v1.1.0
│       │   │   [build-dependencies]
│       │   │   └── autocfg v1.0.1
│       │   └── crossbeam-utils v0.8.10 (*)
│       ├── either v1.7.0
│       └── rayon-core v1.9.3
│           ├── crossbeam-channel v0.5.5
│           │   ├── cfg-if v1.0.0
│           │   └── crossbeam-utils v0.8.10 (*)
│           ├── crossbeam-deque v0.8.1 (*)
│           ├── crossbeam-utils v0.8.10 (*)
│           └── num_cpus v1.13.1
│               └── libc v0.2.126
│       [build-dependencies]
│       └── autocfg v1.0.1
├── rayon v1.5.3 (*)
└── serde v1.0.143

(with the dev-features omitted, of course).

Nice and clean. I like it.