Refactor: LF for CMakeLists.txt
Refactor: Simplify optional comment
More stringent leap second validation
Parse folding whitespace
Refactor: Extract cfws skipper into separate component
Skip comments
Skip quoted pairs
Skip recursive comments
Refactor: Handle comments entirely in the skipper
Parse obsolete 2-digit year
Parse obsolete 3 digit year
Parse obsolete time
Parse obsolete time zone names
Parse obsolete military time zones
Parse obsolete comment characters
Parse obsolete quoted comment characters
Refactor: Extract suite for skipper tests