Make redstone light up when walked upon

mods/walkover/README.md

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+WalkOver
+--------
+
+Some mode developers have shown an interest in having an on_walk_over event. This is useful for pressure-plates and the like.
+
+See this issue - https://github.com/minetest/minetest/issues/247
+
+I have implemented a server_side version in lua using globalstep which people might find useful. Of course this would better implemented via a client-based "on walk over", but it is sufficient for my needs now.
+
+Example Usage
+-------------
+
+    minetest.register_node("somemod:someblock", {
+           description = key,
+           tiles = {"somemod_someblock.png"},
+               groups = {cracky=1},
+                 on_walk_over = function(pos, node, player)
+                
+                        minetest.chat_send_player(player, "Hey! Watch it!")
+                 end
+    })
+
+