There is also no trailing whitespace.

Newer versions of MSVC are unhappy with the strategy of the build
 environment redefining "inline" (even though they don't support the
 actual keyword). Instead we define OPUS_INLINE to the right thing
 in opus_defines.h.

This is the same approach we use for restrict.

This fixes tansig_approx() to avoid crashing when the input is NaN.
The problem could only be triggered when calling the float API with
a float build at a complexity of 7 or more (i.e. analysis called).
Since the crash was due to an out-of-bound read (typically the index
is INT_MIN), it's unlikely to be exploitable in any other way than
causing a crash.

Code is still float, but at least tonality esitmation seems to work.
Speech/music analysis is still disabled.

Updates the project files to include the new encoder source files.
Use OPUS_RESTRICT and include config.h to set the proper defines
for build under MSVC.

Also, reducing the VBR rate on panned mono