Refactoring Ui events in core (#4418)

* Ui events base (#4370)

* Add constants for new ui event types

* Add property to indicate an event as UI event

* Click events (#4372)

* Creating new ui base class.

* Refactor theme event (#4391)

* Add themeName property to theme event

* Refactor marker move events. (#4389)

* Refactor trashcan open event (#4392)

* Refactor selected event (#4387)

* Refactor toolbox item change event (#4394)

* Refactor bubble open events (#4390)

* Refactor block drag event (#4388)

* Viewport events (#4395)

* Fix event filtering for ui events (#4401)

* Move events to new directory and rename Ui events base (#4400)

* Move events to new directory and rename Ui events base

* Add missing fromJson implementation for click event (#4410)

* Adding serialization tests for events

* Zoom controls event (#4407)

* Refactor zoom event

* Rename IS_UI_EVENT to isUiEvent

scripts/gulpfiles/typings.js

@@ -27,6 +27,7 @@ function typings() {
   const blocklySrcs = [
     "core/",
     "core/components",
+    "core/events",
     "core/keyboard_nav",
     "core/renderers/common",
     "core/renderers/measurables",