update issue #31

temporary register the filter dll in a fake registry location and read the registered clsids

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@381 c2f33eb2-41b2-391d-4cb4-d9d0608729ba
update issue #218
fix register filter with paths containing spaces
switch filter_categories combo to "DirectShow Filters" to select filter, because "All Filters" doesn't load the newly registered filter!

git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@382 c2f33eb2-41b2-391d-4cb4-d9d0608729ba