Use mod.conf for dependencies (#492)

mesecons/depends.txt

mesecons/mod.conf

mesecons_alias/depends.txt

mesecons_alias/mod.conf

mesecons_blinkyplant/depends.txt

mesecons_blinkyplant/mod.conf

mesecons_button/depends.txt

mesecons_button/mod.conf

mesecons_commandblock/depends.txt

mesecons_commandblock/mod.conf

mesecons_delayer/depends.txt

mesecons_delayer/mod.conf

mesecons_detector/depends.txt

mesecons_detector/mod.conf

mesecons_doors/depends.txt

mesecons_doors/mod.conf

mesecons_extrawires/depends.txt

mesecons_extrawires/mod.conf

mesecons_fpga/depends.txt

mesecons_fpga/mod.conf