v0.6.0_alpha1

Alpha release for version 0.6.0, work in Progress!

Changes:

• Overhaul of the general UI layout to improve usability
• Added Zooming (mouse wheel) and Panning (right click)
• Added Undo/Redo (not all actions yet included, e.g. map size changes and group move)
• Added Slot icon representation right on the map
• General tweaks and enhancements