LED Scrolling Text Display

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Version 3.00
- target Android 9 devices, update UI theme
- one touch access to context menu for saved drawings
- can display up to 3 lines of text
- can save and share LED image of saved drawings
- (Android 5+ only) LED animation can be saved and shared as video
- avoid crash when displaying very large LED image on Android 7+ devices
- other minor fixes and improvements