Collation: Workaround for incorrect collation of Estonian

'W' and 'V' should not be considered the same letter for the purposes
of collation in modern Estonian. We work around this by replacing 'W'
and 'w' with 'ᴡ' U+1D21 'LATIN LETTER SMALL CAPITAL W' for sortkey
generation, which is collated like 'W' and is not tailored to have the
same primary weight as 'V' in Estonian.

Bug: 54168
Change-Id: I3e8031b9d1dc18fdb7595fb9fd23e5f930106fa4
Merge "Collation: Workaround for incorrect collation of Estonian"