Screen lifecycle diagram

[alexbudarov]

Environment

• Existing page: https://doc.cuba-platform.com/manual-7.1/screen_controller_events.html

Description of the bug or enhancement

See Android Activity lifecycle diagram: http://android-steps.blogspot.com/2014/02/android-eclipse-managing-activity-life.html

Can we draw something like this and put to Screen Controllers manual section? For ordinary screen, fragment, editor.

[alexbudarov]

Apart from events, add internal steps like "controller is instantiated", "injection", "data containers are loaded if @LDBShow is set", "form fields are generated", ...