Add support for Microsoft Speech Platform.
MSSP is accessible via vbs by simply changing the object to be used (both
SAPI5 and MSSP use the ISpVoice COM interface). Add command line parameter to
sapi_voice.vbs to switch the COM object used, and add the necessary
implementation of the SAPI class to Rockbox Utility.
Important: you will need to install the Speech Runtime separately and install
the version matching the bitsize of Rockbox Utility. I.e. you will need to
install the x86 version even on a x64 machine (unless you build a 64bit binary
of Rockbox Utility).
Change-Id: If760cd69c556c17a2ae539965d0941d16fdc10e1