[Sub-sonic-development] Quick IMF update

[<Do...@as...>]

Just to keep you all informed.

My IMF system should now compile under GCC (hasn't been tested though). I've
added a NOASM define to the global header, just enable the define and all
asm will be substituted for C code.

I will improve that factor over time to be a little cleaner.

Right here is some info to know...

Most MODs play without problems now, some effects are missing but the
majority of standard MODs are working.

You can now select playback rates, 8 or 16 bit, still no choice between mono
or stereo.

The mixing is now 32-bit reduced down the the required output quality (8 or
16 bit). At the moment it's still floating point, but it should become
integer soon ready for MMX optimizations.

I will be talking to Dean about optimizing his central mixer code using some
of the techniques I'm implementing in my mixer so that we get optimal all
round mixing.

I'm hoping to get more effects in and implement S3M support over the next
week.

Doug