don't write TSIZ frame
logging
doc
split user text frame operations into own functions
add some examples
split Save into two internal functions
add a Value() method to the Frame interface
simplify binary reading where possible
rename CustomFrames to UserTextFrames
documentation
add Sanitize stub
export LogFlag type
export File.HasTags field
documentation
mention encodings in docs
support getting and setting comments
support writing unsupported frames
support private frames