Merge branch 'sdcard' into 'master'

.gitlab-ci.yml

hw/fpga/addr_decode.sv

hw/fpga/crc7.sv

hw/fpga/hvl/crc7_testbench.sv

hw/fpga/hvl/cs_testbench.sv

hw/fpga/hvl/mm_testbench.sv

hw/fpga/hvl/sd_cmd_testbench.sv

hw/fpga/sd_controller.sv

hw/fpga/simulation/modelsim/crc7_testbench.do

hw/fpga/simulation/modelsim/sd_cmd_testbench.do

hw/fpga/super6502.qsf

hw/fpga/super6502.sv

sw/io.inc65

sw/main.c

sw/sd_card.h

sw/sd_card.s