Change some events, fix p2 sending gameend twice

- Fixed gameend being sent twice in p2
- Add `ready`, `loader-error`, and `song-select-random` events
- Fixed `session-start` not firing when invited, added event detail
- Fixed `language-change` being fired at startup
- Fixed `version-link` and `about-link` firing twice
- "#song=" will fire `song-select-difficulty`
- Removed `key-events` and `scoresheet-player2`, merged with `scoresheet` and made it more detailed

public/src/js/loadsong.js

@@ -18,7 +18,8 @@ class LoadSong{
 		pageEvents.send("load-song", {
 			selectedSong: selectedSong,
 			autoPlayEnabled: autoPlayEnabled,
-			multiplayer: multiplayer
+			multiplayer: multiplayer,
+			touchEnabled: touchEnabled
 		})
 	}
 	run(){