[Meera] using s1 as reference for s1* glyphs
[Meera] using reference for ബ്ഗ്ര, വ്, ല് and യ്
[Rachana] using k1sh as reference
[Rachana] Using th1s1 as reference
[Rachana] Using xx as reference
revert file creation time change

My fontforge installation modified file creation time.
This commit is to revert that change.
[metainfo] Fix typo
Merge branch 'meera-glyph-reference' of https://github.com/jishnu7/fonts into refglyphs
Merge branch 'rachana-glyph-reference' of https://github.com/jishnu7/fonts into refglyphs
Merge branch 'refglyphs' containing glyph references for Meera and Rachana by Jishnu