chore: increase test timeouts to 10s

xml_Test.ts still had a timeout of 3000ms, which sometimes gave an AppVeyor timeout for Actor Prelude
see AppVeyor build 22232215

.appveyor.yml

@@ -1,9 +1,7 @@
 image: Visual Studio 2017
 environment:
-  timeout: 4000
+  timeout: 10000
   matrix:
-    # - nodejs_version: "6"
-    # - nodejs_version: "7"
     # - nodejs_version: "8" 
     - nodejs_version: "10"
 platform:

test/Common/FileIO/Xml_Test.ts

@@ -52,7 +52,7 @@ describe("XML interface", () => {
                 TestUtils.createOpenSheetMusicDisplay(div);
             openSheetMusicDisplay.load(score);
             done();
-        }).timeout(3000);
+        }).timeout(10000);
     }
 
     it("test IXmlElement", (done: MochaDone) => {