~ruther/vhdl-i2c

ref: 4314be3c384f967d9d034157ca7b2242cf9708d4 vhdl-i2c/vivado/nsv_i2c.srcs/constrs_1 d---------
tests: add mcu tests working with slave top designs
chore: add Vivado project for Basys 3 board
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