Fix issue #124 : Select MediaType dialog - click on column headers of list view to sort or reverse existing sort
Sort setting is persisted for application lifetime
The default <any> entry is always at the top of the list
Sort by an column except index uses case sensitive comparison as case is significant in some cases e.g. MEDIATYPE_<fourcc>


git-svn-id: http://graph-studio-next.googlecode.com/svn/trunk@232 c2f33eb2-41b2-391d-4cb4-d9d0608729ba