Adjust ɨ and ɉ

[moyogo]

The ɨ and ɉ have a crossbar that is too wide and they have the width of i and j. They clash with letters before and after.

This PR:

• Adds _part.crossbar_narrow
• Adjusts uni0268.ccmp to use _part.crossbar_narrow
• Adjusts ibar to use uni0268.ccmp
• Adjusts uni0249.ccmp to used _part.crossbar_narrow
• Adds anchors to mentionned glyphs
• Adjusts jdotless 'cross' anchor
• Adjusts jdotlessbar
• Rename jstroke.ss07 to uni0249.ss07 to match uni0249 (or uni0249.ccmp)
• Adds ibar.ss07
• Updates ss07 for ibar.ss07 and uni0249.ss07
• Updates ccmp with useMarkFiltering for softdotted substitution lookup