Handling nukta normalization

[akshdeep-singh]

Summary

Nukta ਼ (U+0A3C) when added to consonants makes them to sound different than their original form.

Some forms are already standardised by Unicode.
However, the non-standard forms may be handled differently based on the font used or the platform.

For example: ਡ + ਼ may be shown as ਡ਼ by some fonts and ੜ in others.

In case the font shows ੜ, we can force the font to show ਡ਼ using ZWJ (U+200D):
ਡ + ZWJ + ਼.

Handling of nukta normalization for both cases should be implemented.
The user should be able to select which type of normalization is required.

Related discussion: #210

Approach