added pitch_range to SPDMsgSettings
added pitch_range support to the msg_settings system, and defined macros in msg.h
defined pitch_range functions for the language apis, and added support for setting its value during configuration
added pitch_range options to spd-say
implemented pitch_range support for the generic and Espeak modules
included pitch_range testing for most of the tests (excepting ssml)
updated the documentation to reference pitch_change additions
added support for configuring DefaultPitchRange