primitives crate:

Removed old 32 bytes `Key`. Replaced it with `u32`. Added `KeyComposer`, it is a helper struct that does all manipulation with the storage key. It allows concat two storage keys into one, compute storage key for fields based on the filed, struct, enum, variants names.
Removed all tests and benches. Didn't add it for new primitives because the key is standard `u32` and all keys are calculated during compilation.

storage crate:
Removed `SpreadLayout`, `PackedLayout`, `SpreadAllocate`, `PackedAllocate`, and all related helper functions.
Removed `Packed` struct cause it is the default behavior for storage right now. Added `Lazy` struct that allows `get`/`set` value from/into the storage. It is similar to `Mapping` but works with one storage key and one value.
Introduced new main traits to work with storage in `storage/src/traits/storage.rs`.
Also added a new `OnCallInitializer` trait to improve the flow with upgradable contracts and support initialization on demand by default. Added `pull_or_init` macro that inits the storage struct if it is impossible to load it. It also can be used as optimization for contracts without an explicit constructor.
Replaced implementation of old traits for main primitives with a new one. Added blanket implementation of new traits for structures that are `Packed` by default. It reduces the amount of code and adds support of generic structures but adds problems with tuples(now tuples implement new traits only if inner items are `Packed`).
Introduced `AutoKey` and `ManualKey` that allows specifying which key the user wants to use. Added support of it into all traits and structures.
Refactored `Mapping` to follow new rules.

.config/cargo_spellcheck.dic

@@ -38,6 +38,7 @@ defragmentation
 deploy
 dereferencing
 deserialize/S
+deserialization
 dispatchable/S
 encodable
 evaluable

crates/primitives/Cargo.toml

@@ -18,20 +18,12 @@ include = ["/Cargo.toml", "src/**/*.rs", "/README.md", "/LICENSE"]
 ink_prelude = { version = "4.0.0", path = "../prelude/", default-features = false }
 scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["derive", "full"] }
 scale-info = { version = "2", default-features = false, features = ["derive"], optional = true }
-cfg-if = "1"
-
-[dev-dependencies]
-criterion = "0.3.1"
+sha2-const = { version = "0.1.2", default-features = false }
 
 [features]
 default = ["std"]
 std = [
     "ink_prelude/std",
     "scale/std",
     "scale-info/std",
-]
-
-[[bench]]
-name = "bench"
-path = "benches/bench.rs"
-harness = false
+]