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Rename SES_Special to SpecialSemanticSignup

Authored by Withoutaname.

Description

Rename SES_Special to SpecialSemanticSignup

Also updated file header documentation for the special page
and removed a duplicate entry for SES_UserAccountDataChecker from
$wgAutoloadClasses which originally pointed to the special page file.

Change-Id: I70a3e70024e7dfbad95608c4f563aee626211bc0