Generate ibus XML file for all the supported languages

[navaneeth]

Currently Hindi & Malayalam is hardcoded in the build file. Varnam supports many more languages. libvarnam has an API to get list of all supported schemes. Use it to dynamically create all necessary XMLs

[Kishore96in]

I was wondering how to implement this. The simplest way is to allow the user to pass an environment variable to cmake (while building) that lists the languages supported by the locally installed varnam. Would this be acceptable?

PS: The comments inline mentioned using libvarnam to detect supported lanugages, but I couldn't figure out any simple way to call the relevant function from within the cmakelist (without creating an entire separate script just to identify the available languages).