Fix loading compendium information for items

All the relevant changes are in _Statblock/Statblock.vb, the rest are from the project being upgraded to VS2012.

Items never load properly because character builder gives out old, invalid URLs for items when it exports a character.

With these changes, when a magic item is encountered, it will search the compendium and find the right URL to use.  This happens when the character is imported to the library, so it will only work if you have an internet connection when it is being imported.  If you don't, it will have blank URLs.

Works on all the items I've tried so far.