- Switched Main Menu button order to make more logical sense
- Expanded HouseBuildingFunctions.cs to allow drawing of arbitrary Icons
- Added Interior.cs for all interior items(doors and appliances);
- Fixed bugs with door placement; Every interior item now has a bounding box to determine correct placement
- Added appropriate error messages for wrong user behavior
- Improved the Eraser function: Interior items can now be removed separately; Clicking on a wall will remove the room as well as all interior items belonging to this room