Feature: Intel HEX loader

[dragonmux]

In this PR we address the Intel HEX support that has till now just been a stub that bombs the tool out. This completes the trifecta of formats the tool understands (raw .bin, ELF, ihex) and can use as a data source for the firmware.

This is mostly just for completeness sake as the build system is capable of producing a .hex of the firmware. The preference is still for users to have the tool work with ELF files as they're the most information-complete and robust mechanism available.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
src/firmware_type.rs	95% smaller
src/firmware_file/mod.rs	81% smaller
src/firmware_file/elf.rs	81% smaller
src/firmware_file/ihex.rs	2% smaller

[codecov]

Codecov Report

❌ Patch coverage is 0% with 181 lines in your changes missing coverage. Please review.
✅ Project coverage is 5.84%. Comparing base (a952aba) to head (46ea365).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/firmware_file/ihex.rs	0.00%	161 Missing ⚠️
src/firmware_file/elf.rs	0.00%	13 Missing ⚠️
src/firmware_type.rs	0.00%	6 Missing ⚠️
src/firmware_file/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #70      +/-   ##
========================================
- Coverage   6.11%   5.84%   -0.28%     
========================================
  Files         29      29              
  Lines       3237    3390     +153     
  Branches    3237    3390     +153     
========================================
  Hits         198     198              
- Misses      3019    3172     +153     
  Partials      20      20              

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[esden]

LGTM, merging

As a sidenote, even though we prefer if users use the elf files to update the firmware we will need the support for these formats down the road for other things, so it is definitely not a wasted effort. :D

[dragonmux]

Agreed, especially with what's planned for the tool's future wrt becoming a more capable BMP-specific replacement for BMDA!