Optimize glyphs for four characters.

[jmcwilliams403]

Greek Gamma straight/curly optimization:
γᵞᵧ
Before (notice the seam):

After:

Cyrillic Lower Straight U Optimization:
уўүұ
Before (cross position appears raised):

After (fixing this also facilitated fixing straight/curly gamma as a side benefit):

Turned r palatal hook optimization:
ᶁ𝼕
Thin before:

Thin after:

Regular before:

Regular after:

Heavy before:

Heavy After: