The configuration values for executable based TTS systems is stored in member
variables. Instead of reading them multiple times provide a function for that
and move searching the executable to the loading function.
Previously the executable was only searched in the path when opening the TTS
configuration. Having this in the loading function removes that unnecessary
step in case the TTS is in the path (and doesn't require additional
configuration).
Change-Id: I06799b55545dcb719ee3c916795b20e01c248a15
Support retrieving the vendor name of the TTS. This will be used by TTS string
corrections. Currently no other TTS but SAPI supports this, and only correction
strings for SAPI voices depend on the vendor information.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30609 a1c6a512-1295-4272-9138-f99709370657
