DBC Assertion Implementation

[ztnel]

Description

Implemented a small assertion library which allows tracing assertion failures without the need to store variable length strings for filenames etc. The assertion saves the PC and LR registers into a global assert tracing struct for inspection. For debug builds the assert halts the cpu with bkpt to allow developers to inspect the tracing struct while the CPU is halted. In release builds we enter a spin lock to allow the hardware watchdog to reset the CPU.

We will need a way to save the trace variables to NVM so it can be reported on next boot.

Issues

closes #68

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.46%. Comparing base (7cc4aac) to head (7864033).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #69   +/-   ##
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  Coverage   36.46%   36.46%           
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  Files          12       12           
  Lines         650      650           
  Branches      185      185           
=======================================
  Hits          237      237           
  Misses        303      303           
  Partials      110      110           

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