Add error log window

Try and fix issue with iOS file extension selector

index.html

@@ -34,8 +34,9 @@
 				document.body.style.setProperty('--color-dark', stored_theme.colors.dark);
 			} catch (err) {}
 		}
-
+		window.ErrorLog = [];
 		window.onerror = (message, file, line) => {
+			window.ErrorLog.push({message, file, line})
 			if (typeof Blockbench != 'undefined' && Blockbench.setup_successful) return;
 
 			let error_element = document.querySelector('#loading_error_detail');

js/file_system.js

@@ -46,7 +46,7 @@ Object.assign(Blockbench, {
 			Blockbench.read(fileNames, options, cb)
 		} else {
 			let isIOS =  ['iPad Simulator', 'iPhone Simulator', 'iPod Simulator', 'iPad', 'iPhone', 'iPod'].includes(navigator.platform) ||
-				(navigator.userAgent.includes("Mac") && "ontouchend" in document);
+				(navigator.userAgent && navigator.userAgent.includes("Mac") && "ontouchend" in document);
 			
 			if (isIOS && options.extensions && options.extensions.length > 1) {
 				let options = [];
@@ -59,10 +59,10 @@ Object.assign(Blockbench, {
 					form: {
 						extension: {label: 'File Type', type: 'select', options}
 					},
-					onConfirm({extension}) {
+					onConfirm(formResult) {
 						$('<input '+
 							'type="file'+
-							'" accept=".'+extension+
+							'" accept=".'+formResult.extension+
 							'" multiple="'+(options.multiple === true)+
 						'">').on('change', function(e) {
 							Blockbench.read(this.files, options, cb)

js/interface/menu.js

@@ -905,6 +905,17 @@ const MenuBar = {
 					Blockbench.openLink('https://www.blockbench.net/wiki/api/index');
 				}},
 				'open_dev_tools',
+				{name: 'Error Log', condition: () => window.ErrorLog.length, icon: 'error', color: 'red', keybind: {toString: () => window.ErrorLog.length.toString()}, click() {
+					let lines = window.ErrorLog.slice(0, 64).map((error) => {
+						return Interface.createElement('p', {}, `${error.message}\n - In .${error.file.split(location.origin).join('')} : ${error.line}`);
+					})
+					new Dialog({
+						id: 'error_log',
+						title: 'Error Log',
+						lines,
+						singleButton: true
+					}).show();
+				}},
 				{name: 'menu.help.developer.reset_storage', icon: 'fas.fa-hdd', click: () => {
 					if (confirm(tl('menu.help.developer.reset_storage.confirm'))) {
 						localStorage.clear()