Style perf improvements (#2342)

* Add css-perf app.

* Style properties now check only properties that are set.
Image utils module required on top (instead of in onMeasure) to improve performance.
Remove try/catch block when Style applies native property.

* fix tslint

* Fix broken merge
Update package.json version

* Failed miserably - if the try/catch around applyProperty method is removed - TextField fails big time.
TextField needs some good refactoring as well as calls to _updateTextDecoration & _updateTextTransform
utils - setTextTransform & setTextDecoration should be split, typing support should be added.

tests/package.json

@@ -6,10 +6,10 @@
   "nativescript": {
     "id": "org.nativescript.tests",
     "tns-ios": {
-      "version": "2.0.0"
+      "version": "2.1.0"
     },
     "tns-android": {
-      "version": "2.0.0"
+      "version": "2.1.1"
     }
   },
   "dependencies": {
@@ -22,4 +22,4 @@
     "filewalker": "0.1.2",
     "lazy": "1.0.11"
   }
-}
+}