TCP and UDP unicast/multicast chat

What's Changed

Multicast chat by @Szaroslav in #37
Client: Refactoring, split init function into smaller parts by @Szaroslav in #38
Socket: Remove UDP_MULTICAST type by @Szaroslav in #39
Logging: Replace the server and client titles by @Szaroslav in #40
Update of message and buffer size constants by @Szaroslav in #41
Fix: Remove a weirdo include by @Szaroslav in #42
Server: Fix waiting for TCP socket [MacOS] by @Szaroslav in #43
Multicast: Fix binding the sockets by @Szaroslav in #44
Multicast: Add a dedicated port by @Szaroslav in #45
Client: Clean up call of send_udp_message by @Szaroslav in #46
Client: Clear potential sequence codes by @Szaroslav in #47
Server: Add array of buffers to introduce thread safety by @Szaroslav in #48
Add a new multimedia example file by @Szaroslav in #49

Full Changelog: v2.0...v3.0