~ruther/verilog-riscv-semestral-project

ref: acf0f7243e7b45dc7db8e51c5c7ae659f7ef2bb3 verilog-riscv-semestral-project/testbench d---------
feat: implement sb, sh, lb, lh support via masking
test: add simple cpu test
test: add basic testbenches
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