Shuffle floor colors each round, keep eliminated players out of spectator mode, add optional match music

src/main/resources/config.yml

@@ -21,10 +21,27 @@ sounds:
   round-complete: BLOCK_NOTE_BLOCK_BELL
   victory: UI_TOAST_CHALLENGE_COMPLETE
 
+music:
+  # Optional background music for the duration of a match, played on the client's MUSIC
+  # volume slider (separate from sound effects). Off by default since it's a matter of taste.
+  enabled: false
+  # Any Bukkit Sound enum name that's actually a track, e.g. one of the MUSIC_DISC_* sounds
+  # or a MUSIC_* ambient track. Invalid names are logged and skipped, never crash the plugin.
+  track: MUSIC_DISC_PIGSTEP
+  volume: 1.0
+
 performance:
   # blocks processed per server tick when generating/removing/restoring the floor
   floor-blocks-per-tick: 200
 
+floor:
+  # If true (default), the floor's material-to-position layout is randomly reshuffled
+  # (same set of positions and same count of each material, just rearranged) at the start
+  # of the match and before every round restore, so the board isn't a static, memorizable
+  # pattern across the whole game. Purely in-memory - the arena's saved generated-layout
+  # (from /bp generate) is never modified by shuffling.
+  shuffle-each-round: true
+
 # example/default timings used when creating a brand-new arena via /blockparty create
 defaults:
   countdown-duration: 15