fixes#510
unfortunately, anyone compiling with VC2005 must now ensure all Visual
Studio service packs and patches are applied - or manually strip out the
additional manifest dependency on subversion 762 after every build
(ugh), or we could add an application config file to redirect SxS
version from .762 to .4053 (ugh)
This was SVN commit r7641.
Removed .manifest files (because the SxS system is too confusing - but
we should sort it out when properly distributing the game).
Removed ScEd files, because it's out of date and unsupported.
This was SVN commit r3780.
