v2 cleanup (#427)

* refactor: remove useless template

* refactor: handle promise

* refactor: associate labels to fields

* refactor: simplify checking if element exists

* refactor: prevent reassigning

* refactor: avoid wildcard imports

* refactor: simplify imports

* refactor: simplify boolean comparison

* chore: version bump

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ontime",
-  "version": "2.0.0-beta6",
+  "version": "2.0.0",
   "description": "Time keeping for live events",
   "keywords": [
     "lighdev",