* move win32/config0.h -> config/config_windows0.h
* move win32/stdint.h -> msvc/stdint.h
* move posix/defines.h -> config/config_unix.h
* add config.h - brings in config_(windows|unix).h as required
* add config.h to *.cpp
* Self-contain FFmpegSource2 with required function defines wrapped with
__UNIX__ instead of the now removed defines.h.
* Edit aegisub_vs2008.vcproj to remove explicit inclusion of config.h, also
change VCPreBuildEventTool to create windows_config.h from
windows_config0.h. Add msvc to include path.
* Change configure to create ./acconf.h instead of posix/acconf.h
This will allow us to create a more standard and platform agnostic way of
configuration aegsisub during build time.
Originally committed to SVN as r2621.
Also removed absolute dependency on hunspell, Aegisub should just build without spellchecking support now. Finally removed requirement to have built with at least one spellchecker. (That was stupid.)
Originally committed to SVN as r1112.
