ALL: automated UI test

[mgerhardy]

Event based

Needed

a) ability to record and save the events (WindowedApp::onRunning()) b) ability to play back recorded events c) custom event to handle screenshots (just to automatically validate the proper ui state or to present screenshots in case of an error)

Criterias

• The system should be guarded with a preprocessor define
• The events must be stored compressed
• The applications have two new command line arguments - one for save events to file, and one for play back events from file.

imgui test framework