remove Identifier param. 99% of the time, identifier is not provided,
resulting in a useless call
end result:
provide 'create new' and 'create from' constructors
be explicit that the string is empty rather than possibly missing
disallow encrypted export for BK4 (they're not encrypted), removes type
check
simplify replaceall in showdownset (don't call ReplaceAll 4x, just get
valid chars and rebuild)
simplify get ribbon sprite name (precompute ToLower and appended values
