added VueRouter to composer; integrate router.php from extensions

composer.json

@@ -337,6 +337,17 @@
 				}
 			}
 		},
+		{
+			"type": "package",
+			"package": {
+				"name": "vuejs/vuerouter4",
+				"version": "4.1.3",
+				"dist": {
+					"url": "https://unpkg.com/vue-router@4.1.3/dist/vue-router.global.js",
+					"type": "file"
+				}
+			}
+		},
 		{
 			"type": "composer",
 			"url": "https://asset-packagist.org"
@@ -408,7 +419,8 @@
 		"twbs/bootstrap3": "3.4.*",
 		"twbs/bootstrap5": "5.1.*",
 
-		"vuejs/vuejs3": "3.2.33"
+		"vuejs/vuejs3": "3.2.33",
+		"vuejs/vuerouter4": "4.1.3"
 	},
 	"config": {
 		"bin-dir": "vendor/bin"