Adding RISCV instruction memory view

[onsdagens]

This adds a left side view for the instruction memory similar to the data memory view.

It supports adding and removing breakpoints via right clicking instructions.

TODO:

• [ ] If an unsupported instruction exists in the memory, the thread responsible for stringifying it will panic. This is handled and fine IMO, but leaves us with an ugly trace that needs to be gotten rid of.
• [x] Highlighting the instruction currently under execution.
• [x] Adding some sort of visual cue for where breakpoints are currently present.
• [ ] Adding symbols to the view

[perlindgren]

Seems like program is disassembled directly from the binary. In syncsim, we used the objdump which disassembles with inline symbols. Guess the symbols are there as part of the DWARF info, not sure what the best way to recover symbols are, to use objdump output or use the rust debug crate to recover DWARF info.