Changes: * Clicking and dragging with MMB pans the screen (except while placing objects). * The menu animation speed can be increased in Settings. * Compound regions can be selected by holding shift with a region selected and dragging to add a region. * Undo/redo interacts sensibly with cut/paste. * Added a "Duplicate with Wires" action (can be bound in Settings) * Key bindings can now include the modifier keys Shift and Ctrl, if desired. * Allowed save selection menu to span multiple pages when necessary. * Fixed the background generation for larger levels, keeping proper parallax effect. * Various improvements to the Lua API: * ...Added are .step_count and .step_time properties in CollectorHandle * ...Added a new class "ElectricStatus" which accurately tracks the state of pistons and such. * ...Added a new class "MouseInfo" for state:on_interface_update callbacks * ...Added game:track(...) which allows Lua to track an object. * ...setup_utility.lua allows achieve_main to be a table and has the new user_block_indices key * ...Added .input_extra and .output_extra properties to the CreatePortal interaction. * ...Added :neighbor and :meeting methods to physics side. * ...Resizing the top portion of the map now works properly.