Merged PR's from SteamKit

[LossyDragon]

This is kind of a rolling issue list of PR's over at SteamKit that have been merged or pushed to it.

Not everything below may be applicable to JavaSteam, if they are not, they are removed once it's looked into more.

• CDNClient
• WebApi
• PR 1028 (Allow consumers to specify a custom Machine Info Provider)
• PR 1102 (Add extra asserts connection logic)
• Issue 1290 (Restructure samples folder)
• PR 1379 (Less allocations in non-utf8 string reads, fix non-utf8 string writes, optimize both with stack / pool alloc)
• PR 1381 (Improve encryption allocations)
• PR 1382 (Optimize gzip in HandleMulti)
• PR 1383 (C# Use ArrayPool for reading websocket messages)
• PR 1384 (Reduce allocations)
• PR 1389 (Reuse StringBuilder in KVTextReader)
• PR 1390 (Simplify callback dispatching)
• PR 1391 (Make client msg handlers a simple list)
• PR 1392 (Delete SteamTrading Handler)
• PR 1397 (C# Use BufferBlock for the callbacks queue) (Update: Using Kotlin Channels)
• PR 1402 (Insert websocket servers first so that they are preferred)
• PR 1420 (Changing default Protocol from TCP to WebSockets.)
• PR 1422 (Switch to GetCMListForConnect)
• PR 1449 (Remove CMList)
• Commit 76163ad7998f20674ba024db54679e660f62e7ab (Add keyvalues test for AlternateEnd)
• Commit 453aa39b14652bfffc228046aff6a2728856569f (Move GetCDNAuthToken to SteamContent)
• PR 1407 (GetAuthSessionTicket implementation)

[LossyDragon]

Checked off PR 1015 as Java on other platforms allows longer thread names.

[LossyDragon]

Checked off PR 1067 as the fields are nullable already.