WIP: compile other MIPS programs

[dannywillems]

Also see https://doc.rust-lang.org/nightly/rustc/platform-support.html#tier-2
And for testing #2605
Use elf to read initial memory/register state.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.10%. Comparing base (ae58bc5) to head (cf718d9).
Report is 793 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2726      +/-   ##
==========================================
- Coverage   72.52%   72.10%   -0.43%     
==========================================
  Files         247      258      +11     
  Lines       57691    63000    +5309     
==========================================
+ Hits        41843    45423    +3580     
- Misses      15848    17577    +1729     

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[dannywillems]

For however who will work on this, see an ELF loader here

[dannywillems]

Note that the ELF loader has been merged. Should work for small programs, but still need to be polished.
It will be part of the improvements for the RISC-V interpreter.

[dannywillems]

Closing in favor of #2906 and #2911 and #2886