Add custom Don

- Registered users can customise the colour of their Don and it will appear for other players
- Bug fixes:
  - Add lyrics checkbox to admin page
  - 2P shows above "creative" or "with lyrics" labels
  - Prevent accidental alt and menu keyboard presses from triggering browser menus
  - Fixed mouse hitboxes on difficulty selection
  - Clean cached sounds and lyrics when another song is loading
  - Fixed debug jumping to the top-left of the screen when hidden
  - Fixed server volume not being applied to songs

public/src/js/p2.js

@@ -131,6 +131,7 @@ class P2Connection{
 					this.hashLock = false
 				}
 				this.name = null
+				this.don = null
 				scoreStorage.clearP2()
 				break
 			case "gameresults":
@@ -165,7 +166,8 @@ class P2Connection{
 				}
 				break
 			case "name":
-				this.name = response.value ? response.value.toString() : response.value
+				this.name = response.value ? (response.value.name || "").toString() : ""
+				this.don = response.value ? (response.value.don) : null
 				break
 			case "getcrowns":
 				if(response.value){