CHANGED: Main Window - Replaced buttons by menu items.
ADDED: Model - Map tile types are defined on application startup.
ADDED: Main Window - Menu item for showing a New Map window.
CHANGED: About Window - Changed title from "AboutWindow" to "About".
ADDED: New Map Window - Clicking "Create New Map" creates a new map with the specified properties.
ADDED: Main Window - Toolbar with New and Help buttons.
Merge branch 'master' of github.com:npruehs/SAE-ToolsDevelopment