add mesecons mods

mods/mesecons/mesecons_fpga/doc/fpga/description.html

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+FPGAs can be used to chain multiple logic gates together in a compact manner.
+They come with 4 I/O ports and 10 internal registers,
+which can then be connected with each other to form logic circuits.
+They work fine in unloaded blocks.<br />
+Supported gate types: <b>AND</b>, <b>OR</b>, <b>NOT</b>, <b>XOR</b>, <b>NAND</b>, <b>XNOR</b>, <b>Buffer</b> (=)<br />
+I/O ports: <b>A B C D</b>; Registers: numbered <b>0</b> to <b>9</b>

mods/mesecons/mesecons_fpga/doc/programmer/description.html

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+The FPGA programmer can be used to copy gate configurations from one FPGA to another.<br />
+Shift+Right-Click an FPGA to read its configuration and "remember" it.
+Left-click (punch) FPGAs to write the saved configuration to them.