[CB-3820] correction: icon/splash mechanism is PGB-only
[CB-3820] rm PGB-specific content
[CB-3820] rm PGB-specific icon/splash content
[CB-3820] PGB's splash-screen-duration => CV's SplashScreenDelay
[CB-3820] removed deprecated UseBrowserHistory pref
[CB-3820] clarify when ErrorUrl applies
[CB-3820] clarify defaults for LoadUrlTimeoutValue
[CB-3820] KeepRunning keeps app running after pause event
[CB-3820] describe effect DisallowOverscroll prevents
[CB-3820] rm PGB-only Android compile prefs