Bounce backs

[mattmess1221]

Server bounces you back when flying through cobwebs. This is because the server doesn't know you're flying and you're supposed to slow down while in cobweb.

I've arranged a fix on my fork.
mattmess1221/DaFlightLiteloader@0a2a140

There's also the issue of it happening when trying to noclip through a wall. It bounces you back the first time, but you're still able to go inside the wall if you keep going, unlike the cobwebs. This works fine when in singleplayer.

[dags-]

The slight bounce-back when no clipping is a server-side issue (I believe Spigot only, but perhaps Craftbukkit too).
The work around is to use nms to override the PlayerConnection to handle no clip (a'la Zombes4Bukkit/VoxelModpackPlugin). This however adds overhead and compatibility issues between server/plugin versions.

I don't plan on doing much work for the Bukkit side of things going forward, so no-clip support will remain as an API only implementation.
I'll probably better support it on Sponge when that reaches a more usable state.