v0.5.0: Feature release

• [added] Added license and copyright information
• [added] Added documentation for daemon config files
• [added] Script for performance measurements
• [added] Added more tests and benchmarks
• [changed] Daemon now detects network config files on its own
• [changed] Using display format for addresses
• [changed] Updated dependencies
• [changed] New measurements
• [changed] Only calling crypto_init once
• [changed] Passing listen address as &str
• [changed] Using FNV hash for better performance
• [changed] Using slice operations instead of loops
• [changed] Updated libsodium to 1.0.10
• [changed] Renamed default.net to example.net
• [fixed] Fixed wrong hex address formatting
• [fixed] Fixed peer exchange for more than 65000 peers
• [fixed] Initializing crypto for benchmarks
• [fixed] Removing learned addresses of lost peers