Persistent transparency + getStatusBarHeight method

[aszmyd]

Platforms affected

Android

What does this PR do?

1. It makes statusbar transparency persisten. Earlier when you call methods in this order: overlaysWebView(true) , hide() , show() the status bar gets shown without transparency and pushes webview to bottom. And because we wanted to have statusbar transparent (overlaysWebView) from this point the show/hide should toggle the statusbar visibility and it should always show transparent.
2. Support for StatusBarOverlaysWebView in Android when its pre-defined in project config.xml
3. Added StatusBar.getStatusBarHeight method (Android only) that gets current statusbar height in CSS pixels

What testing has been done on this change?

Manual testing on Android device

[Exilz]

I can confirm your getStatusBarHeight method works. Thanks a lot.

By the way, setting StatusBarOverlaysWebView to false by default solved a problem for us.

We noticed that if we changed this value to false programmatically, the height of the webview was offset by the height of the statusbar which led to the bottom content being cropped.

Please merge this Apache. This is great work.

[janpio]

Hey @aszmyd , this looks like a great PR. Could you maybe invest the time to make separate PRs for the separate features? Would be much easier to merge and be sure that stuff can be undone if needed.

@Exilz Thanks for your comment. The commit you linked to, is this fixing a bug that is currently present? Should there be a PR for this plugin that adopts these changes? If so, would you be kind enough to create one? Thanks!

[aszmyd]

@janpio here you go: #99 and #98

[aszmyd]

I'm closing this one as two separate PR has been made for it.