Arman Jussupgaliyev

Fix alerts returning to the old screen after dismiss if screen is already changed by the application

Make it wait until display really shown. Without it any editing of form contents near `Display.setCurrent` calls can cause NullPointerException because `clearDisplayableView()` is called 

Prevent screensaver while route navigation is active

2

Closes #60 Не мержить, ломает совместимость с BB

https://4pda.to/forum/index.php?showtopic=1070499&view=findpost&p=125999077 Platform: Belle FP2 (Nokia 808)