v4.0-beta10

• added new Nether Fortress and Witch Hut icons
• added recognition for Minecraft 1.9-pre2
• switched windows to use the default Java look and feel again
• renamed the menu entry "Go to Spawn" to "Go to World Spawn"
• fixed rendering issues
• fixed a bug when moving the main window to another monitor
• removed the dos-box from the exe-file
• improved logging information