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!

core/assets/version.properties

@@ -1,7 +1,7 @@
 #Autogenerated file. Do not modify.
-#Sat Mar 24 18:18:45 EDT 2018
+#Sun Mar 25 00:43:28 EDT 2018
 version=release
-androidBuildCode=635
+androidBuildCode=638
 name=Mindustry
 code=3.4
 build=custom build