Common grid layout

[toth-istvan-zoltan]

Create a common (available on all platforms) layout similar to CSS grid.

• [x] grid adaptive function (delegated)
• [x] figure out if I want to use the built-in grid on browser or the common one
• [x] AdaptiveGrid for browser
• [x] class AdaptiveGridLayout extends ViewGroup bridge class for Android
• [x] AdaptiveGrid for Android
• [x] class CustomLayoutView: UIView bridge class for iOS
• [x] AdaptiveGrid for iOS
• [x] common code for the actual layout algorithm

[toth-istvan-zoltan]

• [x] Test on android and iOS
• [ ] Figure out how grid behaves with measure

[toth-istvan-zoltan]

Works on all platforms. Probably needs tuning but it's OK for now.