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.

apps/css-perf-test/app.ts

@@ -0,0 +1,12 @@
+import application = require("application");
+
+global.time = function(): number {
+    if (global.android) {
+        return java.lang.System.nanoTime() / 1000000; // 1 ms = 1000000 ns
+    }
+    else {
+        return CACurrentMediaTime() * 1000;
+    }
+}
+
+application.start({ moduleName: "css-perf-test/root" });