mesecons_x by marek

Adds some new elements to Mesecons mod, to make it easier to build more complex circuits.

New elements:

• autowire tool (black), creates wires automatically (left click to select 'from', right click to select 'to')
• autodelete tool (red), removes wires automatically (left clik removes one block, right click removes entire wire)
• select tool (blue), selects region used by yellow tool
• automove tool (yellow), moves the circuits while keeping nodes connected (left mouse moves to the left, right mouse moves to the right selected region)
• 3input logic gates
• registers: latch and flipflop

TODO:

• support for multiple users
• add better visualisations and graphics