Binary serializer

[MaksymZavershynskyi]

No description provided.

[ilblackdragon]

I don't think we should have floats at all.

[ilblackdragon]

usize is a bit unclear - as it's different on different platform.
I would actually explicitly not have usize and require cast to u32 or u64 explicitly.

[ilblackdragon]

Looks great, I'll merge it into my PR, so can make progress there.

[ilblackdragon]

Just to keep track, bincode benches:

test deserialize_account ... bench:       1,030 ns/iter (+/- 140)
test deserialize_block   ... bench:   2,627,800 ns/iter (+/- 427,695)
test deserialize_tx      ... bench:       2,290 ns/iter (+/- 138)
test serialize_account   ... bench:          78 ns/iter (+/- 16)
test serialize_block     ... bench:   2,180,172 ns/iter (+/- 209,950)
test serialize_tx        ... bench:       2,291 ns/iter (+/- 222)

Will post nbor bench here.

[ilblackdragon]

First stub after conversion:

test deserialize_account ... bench:         150 ns/iter (+/- 21)
test deserialize_block   ... bench:   3,080,186 ns/iter (+/- 317,673)
test deserialize_tx      ... bench:       2,827 ns/iter (+/- 254)
test serialize_account   ... bench:         482 ns/iter (+/- 89)
test serialize_block     ... bench:     141,669 ns/iter (+/- 31,080)
test serialize_tx        ... bench:         681 ns/iter (+/- 184)