Added new options

• [remove]The uf_uppercase option to make all reserved words and identifiers uppercase is abolished.
• [add]Added uf_case option to select uppercase / lowercase / capitalize / nochange of identifiers.
• [add]Added uf_reserved_case option to select uppercase / lowercase / capitalize / nochange of reserved words. In addition, it is possible to specify reserved words to be converted with the uf_reserved_words option.