Added terrain exporting and importing

core/assets/bundles/bundle.properties

@@ -151,8 +151,8 @@ text.editor.generate=Generate
 text.editor.resize=Resize
 text.editor.loadmap=Load Map
 text.editor.savemap=Save Map
-text.editor.loadimage=Load Image
-text.editor.saveimage=Save Image
+text.editor.loadimage=Import Terrain
+text.editor.saveimage=Export Terrain
 text.editor.unsaved=[scarlet]You have unsaved changes![]\nAre you sure you want to exit?
 text.editor.brushsize=Brush size: {0}
 text.editor.noplayerspawn=This map has no player spawnpoint!