fix: shift left only by 5 bits

fix: lui, force rs1 zero, always add

tests: compile only once, copy proram, memory files to correct locations

chore: add python cache to gitignore

feat: add support for official tests

chore: add python to flake

tests: add python test environment for custom tests

chore: load gcd parameters from memory

chore: remove first unused register

chore: move inital sp to 1020

feat: add support for loading and saving ram from disk

feat: pass program to execute by parameter

feat: store c results in memory addr 0

feat: implement ebreak

Breaks the processor, can
exit the testcase

chore: trace memory array

feat: make RAM word aligned, add byte_enable

Support sb, sh, lb, lh using byte enable
instead of non-word aligned reads and writes.

test: add cpu testbenches for c programs

feat: add gcd program for testing

fix: jump according to zero flag, not LSB zero!!

feat: add branches.c test