Pressure plate texturing tweaks

Update mesecons_button/init.lua (change craft recipe format, no gameplay change)

change crafting recipe format

Let's see if someone complains...

Round movestone position, don't forget last pull

Add math library to luacontroller, and make sure to copy stuff so code can't get out of the sandbox.

Avoid borking the luacontroller if the code uses square brackets. When the next stable MT is released, uncomment the formspec_escape call to take advantave of formspec escaping.

Up/down pistons should also have special rules excluding the pusher side (rotated versions of normal pistons).

* Movestones no longer eat nodes when running off the track.
* Movestones no longer eat nodes when colliding with an mvps stopper.
* Movestones no longer pass through mvps stoppers.
* Movestones do not eat nodes when they are suddenly placed in the entity's path.

Support metadata in piston pushing (so that microcontrollers and such can be pushed), support pushing chests (not locked ones though), and add two missing rules for pistons (z- top and bottom, but not z- itself). This still avoids the piston pushing power source issue.

Digging and footstep sounds for everything that needs them! Plus, pushing buttons, punching switches, and flipping levers all make sounds.

Fix bug texture in mesewire for 0.4 stable

Vertical piston selection boxes

equivalents

* Craft them from three wires in a vertical row
* Craft them back into mesecons by just putting one of them in the grid