Extract general-purpose ui infrastructure to viewfx package
Introduce viewfx subpackages
Move {mightypork.rpack.utils.DesktopApi => io.bitsquare.util.DesktopUtil}
Refactor ViewLoader
Rename i.b.gui.GuiceControllerFactory => v.v.s.guice.GuiceViewFactory
Use ViewFactory interface in favor of GuiceViewFactory impl
Move i.b.gui.ViewLoader.java => viewfx.view.support.ViewLoader
Bind ViewFactory interface to GuiceViewFactory impl (fixes broken test)
Fix broken tests and app exceptions due to ViewLoader changes
Extract ViewLoader interface and introduce FxmlViewLoader implementation
Introduce viewfx.view.support.CachingViewLoader

... and move view.fxml package to view.support.fxml