This moves the libespeak source (*.cpp) files to src/libespeak-ng
and renames the C files (libespeak, espeak, speak) so they have
a .c file extension.

The libespeak files are supposed to be C code, so use C linkage
for all the functions defined in that code when they are being
referenced in the C++ code (i.e. espeakedit).

Changed -b option to include an option for 16 bit character input.

numbers.cpp: Added option for vigesimal number systems for tens+units.

Fixed problems with word-length indications in callback events.

-m option now ignores XML comments.


git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@216 d46cf337-b52f-0410-862d-fd96e6ae7743