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/main.js

@@ -90,9 +90,11 @@ pageEvents.add(root, ["touchstart", "touchmove", "touchend"], event => {
 })
 var versionDiv = document.getElementById("version")
 var versionLink = document.getElementById("version-link")
-pageEvents.add(versionDiv, ["click", "touchend"], () => {
-	versionLink.click()
-	pageEvents.send("version-link")
+pageEvents.add(versionDiv, ["click", "touchend"], event => {
+	if(event.target === versionDiv){
+		versionLink.click()
+		pageEvents.send("version-link")
+	}
 })
 resizeRoot()
 setInterval(resizeRoot, 100)