Investigate rules for ੍ਯ patterns

[bhajneet]

I will open an issue to investigate ੍ਯ patterns.

Originally posted by @bhajneet in #210 (comment)

My thoughts are:

• If preceding consonant has no vowels aside from a left-side vowel
• If half-yayya has no left-side vowels

Then re-render Unicode to put the vowels in the correct locations.

Then we need to test the rendering on different platforms/engines. It would also be nice if we had a programmatic way to check all the platforms/engines (since I don't even remember what all I had to do to test it the first time).

[akshdeep-singh]

Related: shabados/SantLipi#42

[bhajneet]

Since this is more of a font issue, I have decided to not fix this issue. It's possible to reverse this decision with data/explanations, at which point the issue may be re-opened.