MetalWorksMobileTheme, MetalWorksDesktopTheme: check and radio min dimensions tweaks
ComponentsExplorer: removed usage of dpiScale (references #874), moved some layouts into theme, moved icon button skinning into theme
PanelScreen: turned clipping back on by default. shouldn't have been turned off because screens can overlap each other during transitions
LayoutExplorer: turned off manageVisibility on layouts to keep the layout code from running every time the container scrolls, calculated quad size in sample layouts from stage size instead of using dpiScale (references #874)
clarified comments
cleanup on some docs
Removed dpiScale and originalDPI from screens (that should be be handled in the theme. The new ComponentsExplorerTheme shows how to do this cleanly. (closes #874)
added missing return type
Button: added hasLabelTextRenderer property that can be set to false to omit the creation of the label text renderer to improve performance (closes #627)
Themes: omits label text renderer on buttons that don't need one (references #627)