tests: add register dump, printing

feat: add support for official tests

feat: add support for loading and saving ram from disk

feat: pass program to execute by parameter

feat: implement ebreak

Breaks the processor, can
exit the testcase

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