dictionary: started removing qt dependencies

changed quint16 to uint16_t
changed use count to use standard vector
changed free stack to use standard stack
replaced use of Q_UNUSED with just (void)
replaced Qt case sensitivity enumerators with own case enumerators

changed key list to standard vector or strings
changed return value of string access function to standard strings
also changed operator text functions to return standard strings
temporary added conversions to and from QStrings as needed