The class existence check Scribunto used to tell apart current and
B/C versions of SyntaxHighlight does not work with recent versions.
This caused the B/C branch to be invoked unnecessarily, which
resulted in deprecation warnings.
Also, the supposedly non-B/C branch also invoked B/C code which has
no error handling.
The commit removes B/C support and adds a new way of interacting with
SyntaxHighlight.
Bug: T109873
Change-Id: I2d518b5412efbe4e8ddb43e7c465ea55dc44b1a3
normalization-data.lua is updated to Unicode 8.0.0 (libicu57).
charsets.lua is updated to match the character classes used by PCRE 8.35,
which seems to be Unicode 6.3.0.
upper.lua and lower.lua are still based on whatever ancient version of
Unicode is used by mb_strtoupper and mb_strtolower in HHVM 3.18.6.
Bug: T177498
Change-Id: I00b471176e1fd21123c22d187ff222928819e459
