Write Nepali Alphabets

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1. Added writing directional arrows for Vowels and Consonants.
2. You can choose your directional arrow style and its visibility.
3. You can hide and show the letters in board.
4. Added New Color Picker Control for selecting more pencil colours.
5. Added new 468 (Barakhadi) Letters with voice.
6. Added new Voice for Vowels (Swar) and Consonants (Vyanjan)
7. Home Screen menu design Changed.
8. Updated App to Latest SDK.