DEV9: Always bind UDP ports in sockets

[TheLastRar]

Description of Changes

Always bind the UDP source port when using sockets
Reworded some logs
Duplicate FixedPort's connections vector for resetting child connections

Rationale behind Changes

Previously, we would only bind the UDP source port in specific situations (Broadcast, multicast and when src and dst port similar).
This proved inadequate for some games, which would either fail to connect of behave strangely if the source port wasn't maintained.
Expanding the heuristics used to catch every game seemed non-trivial, so I've opted to forgo this previously used heuristic and always bind the port.

This does mean we now sometimes bind the port unnecessarily (namely DNS requests), however, different games use ranges for dynamic ports, so avoiding this seemed not worth the effort.

Additionally, FixedPort's Reset() method could potentially iterate over a modified vector if the child connection closed itself (and thus got removed from the connections vector in FixedPort's connection closed handler).
Duplicating this vector avoids that situation.
This also allows us to reduce the scope of the lock in Reset(), avoiding a deadlock (or crash) as FixedPort's connection closed handler would also try to lock.

Suggested Testing Steps

Test networking using Sockets

[AmyRoxwell]

Will be testing tonight.

[AmyRoxwell]

MH2DOS Online still works on linux, even on really heavy situations.

Emulog for reference: i forgot to sent it oops
emulog.zip