Browser cache and important bugfix.

Lively v1.0 onwards REQUIRE windows 10 version 1903 or above.

• Fixed a critical bug in which problem arises when alt-tabbing from a game's fullscreen mode to desktop.
• Lively web browser disk-cache option is now available, website settings and cookies are restored on relaunch if enabled.
  (For example you can use keyboard input in Preview wallpaper option to save state and then set it as wallpaper.)
• Lively web browser now auto-plays videos without having to mute it (default chromium behaviour is overriden.)
• Selected screen is now highlighted in Wallpaper layout /control panel menu.
• All files type added to file dialogue in Add Wallpaper page.
• White border added to color rectangle of lively properties to easily identify darker colors.
• Debug menu option is added, see logs within the application itself.
• Copy of up to 6 logfiles are also kept now.
• Updated libmpv.
• Added Vietnamese and Japanese language thanks to ShaneVu:
  https://github.com/ShaneVu
• Updated some localization texts for german, korean.