Parboti bangla typing

Features: 1) Bangla Keyboard with avro phonetic and fixed layout support. 2) Based official avro phonetic algorithm. 3) Parboti, provat, and natural layout support for bangla typing. 4) unibijoy layout has been removed. 5) Unibijoy Bangla Typing is now converted to parboti bangla keyboard. 6) Hardware Bangla keyboard support for bangla typing.