Changed distibutable 7z file to releases directory.
Changed version.sh to an executable file.
Build system now automatically creates 7z archive for distribution.
Version control is now automatic with build number updates.
sed is for script parsing.
svn client support for windows now added.
Fixed searching order for Dreamcast SDK.
tpal assignment was breaking stict-aliasing rules.
Fixed platform check for Darwin/Linux.
TARGET_PLATFORM was missing in nix based host OS(s).
