What's new/fixed:
- Bitmap preview
- Bitmaps work in Multiplayer and Singleplayer (place shared.map, mainmenu.map and single_player_shared.map in the same folder)

- Hex Viewer has build-in searcher for reflexives, idents,...
- Reverse look up an item in other items
- Item swap changed: Swap (swap both items) or Change (only change selected)
- Small fixes