Entities: Removed Tag attribute; it is taken from the filename instead. Made entity XML files be loaded on demand. Probably stopped crash when maps contain non-existent entities. Fixed a few bugs in entity definitions.

Maps: Stored non-entity objects in XML instead of PMP, for easier manual
editing. Updated existing maps to newest format, so that they can still
work. Added undocumented _rewriteMaps() JS function. Also renamed _mem
to vmem, and reclassified its undocumentedness as unintentional, since
it's reasonably useful.
Loader: added NonprogressiveLoad function, for ScEd/_rewriteMaps/etc
which don't care about progressiveness.
main.cpp: re-enabled vfs_display, since it doesn't crash now
Vector3D: stopped warning

This was SVN commit r2078.

source/ps/VFSUtil.cpp

@@ -10,7 +10,7 @@
 using namespace VFSUtil;
 
 // Because I'm lazy, and it saves a few lines of code in other places:
-bool VFSUtil::FindFiles (CStr& dirname, const char* filter, FileList& files)
+bool VFSUtil::FindFiles (const CStr& dirname, const char* filter, FileList& files)
 {
 	files.clear();