Add support for usage of multiple scripts at once

[vipranarayan14]

Feature

Add support for usage of multiple scripts at once.

vTranslit should translit the string in #<scheme-name>{<string>} to the given scheme-name.

Example

#Latn{Who are you?}
#Deva{kastvam?}
#Taml{yAr nI?}

The above given paragraph should be translited to:

Who are you?
कस्त्वम्?
யார் நீ?