3 functions in jsonComm object

jsonComm object with 3 methods supports jsonComm data conversions to JSON (in javacript).

• unComment: remove trailing comments and multiline comments in JS style from multiline string of jsonComm data format;
• comm2json: converts jsonComm data to valid JSON with save of comments near key:value pairs as values;
• change: changes keys and values in jsonComm data format without touch of comments and another (valid or not valid) text in file.