Added zone's pathways and popup error messages

Sources/app/src/main/java/Common/BuildingManager.java

Sources/app/src/main/java/Structures/BuildingInfo.java

Sources/app/src/main/java/Structures/PathDoor.java

Sources/app/src/main/java/Structures/PathInfo.java

Sources/app/src/main/java/Structures/PathStairs.java

Sources/app/src/main/java/Structures/PathType.java

Sources/app/src/main/java/Structures/RoomInfo.java

Sources/app/src/main/java/Structures/StairsDirection.java

...p/src/main/java/com/furwaz/roomview/BuildingActivity.java

...s/app/src/main/java/com/furwaz/roomview/MainActivity.java

...s/app/src/main/java/com/furwaz/roomview/RoomActivity.java

...s/app/src/main/res/drawable/ic_baseline_add_circle_24.xml

Sources/app/src/main/res/layout/activity_room.xml

Sources/app/src/main/res/layout/add_building_popup.xml

Sources/app/src/main/res/layout/add_pathway_popup.xml

Sources/app/src/main/res/layout/add_room_popup.xml

Sources/app/src/main/res/layout/add_zone_popup.xml

Sources/app/src/main/res/layout/pathway_tile.xml

Sources/app/src/main/res/values-fr/strings.xml

Sources/app/src/main/res/values/strings.xml