* Split out UIMode controller in separate class (in es-app).
* Fix passphrase input for wX360 controllers by ignoring hat-inputs
* Fix font fallback mechanism on rpi for non ascii characters using new Unicode2Chars() method.
* Fix UIMode not being saved due to popup window.
* Introduce FileData Filtering for Kiosk and Kid Modes to:
1. In Kiosk mode: Hide items with metadata tag `<hidden>true</hidden>`
2. In Kid mode: only show items with metadata tag `<kidgame>true</kidgame>`
* ES will auto-revert UI mode back to Full when there is nothing at all to show.
* Changing the setting hideQuitMenuOnKidUI to true will hide this menu.
- Change Power Saver (PS) from Other Settings menu
- 4 Modes are available : Disabled, Default [default], Enhanced, Instant
- All modes work well with Screensavers and Video previews.
- PS is disabled while running Videos through VLC.
- PS is disabled while Scrapping
- Game counts are shown immidiately if in Instant Mode
- PS mode defaults if Transitions are changed while in Instant Mode
- Refactoring System Environment data
- Added Virtual System Manager class
- Added "all", "favorites" and "last played" systems
- Added GuiInfoPopup class for notifications
- Added Favorites to metadata, as well as a shortcut to toggle favorites
- Added warning if enabling systems but themes don't support it
- Added "filter by favorites" per system
- Adjusted "Go to Random Game" behavior to account for the fact that we now have an "All Games" system
- Added "sort by system name" for the collections
- Final changes for VLC screensaver support as well
- ALSA de-init/re-init only when needed
- Adding screensaver options menu inside UI settings
- Slightly moved options (Show Frameskip to "Other Settings", sorting within same menu)
- Adding info popups on random video screensaver and OMX + Game Info setting
- Set default GL clear color to black, rather than white
- Revert changes to ImageComponent intialization that cause white flashes
- Increased ALSA buffer to prevent buffer underruns which stall CPU momentarily
- Improved carousel texture buffering based on navigation direction and speed
