Instead of byteswapping a 32 bit word and writing it out as a
whole (which could even possibly lead to crashes due to
incorrect alignment on some platforms), write it out explicitly
in the intended byte order.
This avoids having to set a define indicating the endianness.
The decoder used WelsMedian while the encoder used WELS_MEDIAN.
The former has two different implementations, WELS_MEDIAN was
identical to the disabled version of WelsMedian.
Settle on using the same implementation for both decoder and
encoder - whichever version of the implementations is faster
should be used for both.
While building succeeds in MSVC 2008, it currently fails in 2012
due to error C1189 "The C++ standard library forbids macroizing
keywords", which is caused by doing "#define inline __inline" in
the macros.h header.
This could have been missed before since it only was triggered
if macros.h was included before some other system header was
included that contained checks against these inline defines.
