Pure rust asymmetric crypto

Pull Request Test Coverage Report for Build 1154040616

3498 of 3780 (92.54%) changed or added relevant lines in 70 files are covered.
1024 unchanged lines in 25 files lost coverage.
Overall coverage decreased (-7.6%) to 86.886%

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tox_core/src/relay/links.rs	54	56	96.43%
tox_crypto/src/lib.rs	21	23	91.3%
tox_core/src/state_format/old.rs	10	13	76.92%
tox_core/src/relay/server/server.rs	41	46	89.13%
tox_core/src/relay/server/server_ext.rs	15	20	75.0%
tox_core/src/onion/client/paths_pool.rs	61	67	91.04%
tox_core/src/relay/client/client.rs	79	102	77.45%
tox_core/src/onion/client/mod.rs	517	543	95.21%
tox_core/src/relay/client/connections.rs	133	181	73.48%
tox_core/src/net_crypto/mod.rs	838	890	94.16%
<!--	Total:	3498	3780	92.54%	-->

Files with Coverage Reduction	New Missed Lines	%
tox_binary_io/src/lib.rs	1	91.67%
tox_core/src/dht/dht_node.rs	1	80.0%
tox_core/src/onion/client/nodes_pool.rs	1	87.8%
tox_core/src/relay/links.rs	1	97.75%
tox_core/src/state_format/old.rs	1	82.21%
tox_core/src/udp.rs	1	3.8%
tox_packet/src/messenger/msi.rs	1	79.1%
tox_core/src/io_tokio.rs	2	75.0%
tox_core/src/relay/server/client.rs	2	82.19%
tox_packet/src/dht/macros.rs	2	95.45%
<!--	Total:	1024	-->