Check for bans on connection as well as join, etc

Should prevent people from being able to bypass this.

TShockAPI/TShock.cs

@@ -1376,6 +1376,8 @@ namespace TShockAPI
 					}
 				}
 			}
+
+			Bans.CheckBan(player);
 			Players[args.Who] = player;
 		}
 

docs/changelog.md

@@ -78,6 +78,7 @@ Use past tense when adding new entries; sign your name off when you add or chang
   * If there is no section called "Upcoming changes" below this line, please add one with `## Upcoming changes` as the first line, and then a bulleted item directly after with the first change. -->
 
 ## Upcoming changes
+* Fixed a security issue with how bans are handled on join. (@ohayo)
 * Fixed `/dump-reference-data` mutate the command names. (#2943, @sgkoishi)
 * Added `ParryDamageBuff` (Striking Moment with Brand of the Inferno and shield) for player, updated `CursedInferno` buff for NPC (@sgkoishi, #3005)
 * Changed the use of `Player.active` to `TSPlayer.Active` for consistency. (@sgkoishi, #2939)