fix some tests, implement event classes for types, and re-implement logging

src/Type/y-xml/YXmlEvent.js

@@ -0,0 +1,16 @@
+
+export default class YXmlEvent {
+  constructor (target, subs, remote) {
+    this.target = target
+    this.childListChanged = false
+    this.attributesChanged = new Set()
+    this.remote = remote
+    subs.forEach((sub) => {
+      if (sub === null) {
+        this.childListChanged = true
+      } else {
+        this.attributesChanged.add(sub)
+      }
+    })
+  }
+}