Added buffer size to config. Added ConfigureAwait(false) to a lot of awaits. -commands is far prettier.

NadekoBot/bin/Debug/data/config_example.json

@@ -2,6 +2,7 @@
   "DontJoinServers": false,
   "ForwardMessages": true,
   "IsRotatingStatus": false,
+  "BufferSize": 4194304,
   "RemindMessageFormat": "❗⏰**I've been told to remind you to '%message%' now by %user%.**⏰❗",
   "CustomReactions": {
     "\\o\\": [