SongSelect: Add About screen

public/src/js/main.js

@@ -1,3 +1,16 @@
+addEventListener("error", err => {
+	var stack
+	if("error" in err){
+		stack = err.error.stack
+	}else{
+		stack = err.message + "\n    at " + err.filename + ":" + err.lineno + ":" + err.colno
+	}
+	localStorage["lastError"] = JSON.stringify({
+		timestamp: +new Date,
+		stack: stack
+	})
+})
+
 function toggleFullscreen(){
 	if("requestFullscreen" in root){
 		if(document.fullscreenElement){
@@ -19,6 +32,14 @@ function toggleFullscreen(){
 		}
 	}
 }
+
+function resizeRoot(){
+	if(lastHeight !== innerHeight){
+		lastHeight = innerHeight
+		root.style.height = innerHeight + "px"
+	}
+}
+
 var root = document.documentElement
 var fullScreenSupported = "requestFullscreen" in root || "webkitRequestFullscreen" in root || "mozRequestFullScreen" in root
 
@@ -26,6 +47,22 @@ var pageEvents = new PageEvents()
 var snd = {}
 var p2
 var disableBlur = false
+var cancelTouch = true
+var lastHeight
+
+pageEvents.add(root, ["touchstart", "touchmove", "touchend"], event => {
+	if(event.cancelable && cancelTouch){
+		event.preventDefault()
+	}
+})
+var versionDiv = document.getElementById("version")
+var versionLink = document.getElementById("version-link")
+pageEvents.add(versionDiv, ["click", "touchend"], () => {
+	versionLink.click()
+})
+resizeRoot()
+pageEvents.add(window, "resize", resizeRoot)
+
 var loader = new Loader(() => {
 	new Titlescreen()
 })