[mesecons] Add NOR and OR gates, and documentation

mods/mesecons/mesecons_gates/doc/and/description.html

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+And gates power their output if both inputs (from left and right) are powered.

mods/mesecons/mesecons_gates/doc/diode/description.html

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+Mesecon diodes, just like real ones, only transfer power (signals) in one direction only.

mods/mesecons/mesecons_gates/doc/nand/description.html

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+Nand gates do not power their output if both inputs (from left and right) are powered, but power it in every other case.

mods/mesecons/mesecons_gates/doc/nor/description.html

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+Nor gates only power their output if none of their two inputs is powered. They are basically or gates with a not gate at their output.

mods/mesecons/mesecons_gates/doc/not/description.html

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+Not gates invert signals, just like a mesecon torch does, but faster. The input is at the opposite side of the output.

mods/mesecons/mesecons_gates/doc/or/description.html

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+Or gates power their output if either of their inputs (or both) are powered. You could basically get the same behaviour with two diodes, but or gates save some space.

mods/mesecons/mesecons_gates/doc/xor/description.html

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+XOR gates power their output if only one input is powered, they're off if either both or none of the inputs is powered.

mods/mesecons/mesecons_gates/init.lua

@@ -122,3 +122,13 @@ register_gate("xor", 2, function (val1, val2) return (val1 or val2) and not (val
 	{{"mesecons:mesecon", "", ""},
 	 {"", "mesecons_materials:silicon", "mesecons_materials:silicon"},
 	 {"mesecons:mesecon", "", ""}})
+
+register_gate("nor", 2, function (val1, val2) return not (val1 or val2) end,
+	{{"mesecons:mesecon", "", ""},
+	 {"", "mesecons_materials:mesecon_torch_on", "mesecons_materials:silicon"},
+	 {"mesecons:mesecon", "", ""}})
+
+register_gate("or", 2, function (val1, val2) return (val1 or val2) end,
+	{{"mesecons:mesecon", "", ""},
+	 {"", "mesecons:mesecon", "mesecons:mesecon"},
+	 {"mesecons:mesecon", "", ""}})