watch-all (#456)

* Adding baseline script (it's not fully functional just yet)

* Start watchers in a specific order. Makes the build slower, but prevents out of sync watcher events.

* Run all watchers at same time.

* faster build. use watch-all by default

* Fix package.json

.vscode/tasks.json

@@ -1,6 +1,16 @@
 {
     "version": "2.0.0",
     "tasks": [
+        {
+            "label": "watch-all",
+            "type": "shell",
+            "command": "npm run watch-all --loglevel silent",
+            "presentation": {
+                "group": "watch",
+            },
+            "isBackground": true,
+            "problemMatcher": "$tsc-watch"
+        },
         {
             "label": "watch",
             "type": "shell",
@@ -50,7 +60,7 @@
                 }
             ],
             "dependsOn": [
-                "watch"
+                "watch-all"
             ]
         },
         {