- Add BrowserActivity with WebView, toolbar (back/forward/close), URL bar, progress bar
- SearchFragment: open BrowserActivity instead of PlayerActivity on result click
- Browser allows user to browse the video site directly before choosing to play
- Replace resources.getColor(id, null) with ContextCompat.getColor() for API 21-22 compatibility
- Change android.software.leanback to required=false to allow testing on non-TV emulators