Don't use extra envelope bits for exponential wave routines
Use the stereo percussion handler when opl3 is enabled
Init some more variables in the constructors
Shift the volume up once to make opl sound a bit louder
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3371
Add compiler testing for fastcall attribute
Add the FASTCALL define to visual c
Remove some overkill inline routines
Make sure that all the inline routines in headers are static
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3355
