Add separate variant selectors for Cyrillic Capital/Lower E.

[jmcwilliams403]

Some fonts treat the serifs of Cyrillic E differently than C/Es. For example, Anonymous Pro makes the capital serifed but the lowercase serifless, putting it in line with Cyrillic Ze:
СсЄєЭэЗз

Example under ss02:

ABC.DEF.GHI.JKL.MNO.PQRS.TUV.WXYZ abc.def.ghi.jkl.mno.pqrs.tuv.wxyz
!iIlL17|¦ ¢coO08BbDQ $5SZ2zs 96µm float il1[]={1-2/3.4,5+6=7/8%90};
1234567890 ,._-+= >< «¯-¬_» ~–÷+× {*}[]()<>`+-=$/#_%^@\&|~?'" !,.;:
E3CGQ g9q¶ uvw ſßðþ ΓΔΛαδιλμξπτχ∂ ЖЗКУЭЯжзклмнруфчъыьэя <= != == =>

Comparison of some E/Es/Ze derived characters under ss02:

ЭӘЗэәз
ↃↄɘƆɔǝ
СҼсҽе

This also opens the door for adding capped serifed variants in the future like #2026 shows for Latin E:
ЕеЭэ
Source Serif:

Palatinto Linotype: