Nanotrasen Block Game is here (#2131)

* tetris!

* softdropping & left,right key holding

* started work on the ui

* playable state

* there you go exp

* multiuser rework

* ui update refactor

* blockgame™️

* highscores, keybindings, ui refactor

* speed adjusts
leveling

* highscorebackground tweak
speed tweak

* NULLABLE

* yes

Content.Shared/GameObjects/ContentNetIDs.cs

@@ -76,6 +76,7 @@
         public const uint MOB_STATE_MANAGER = 1070;
         public const uint SLIP = 1071;
         public const uint SPACE_VILLAIN_ARCADE = 1072;
+        public const uint BLOCKGAME_ARCADE = 1073;
 
         // Net IDs for integration tests.
         public const uint PREDICTION_TEST = 10001;