[Rachana] Add special characters for typogprahy
        Left Single Quote, Right Single Quote, Left Double Quote
        Right Double Quote, En Dash, Em Dash, Bullet

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Add Old Style Figures/Numerals

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Adjust LBearing and RBearing of Arabic and Old numerals

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Add 'onum' feature to 'mlm2' spec also

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Add stacked forms of യ്ച്ച, ല്ച്ച,ഴ്ച്ച

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>