Move more of tostring.hpp into source file and remove tuple printing recursion

[ZXShady]

I moved more stuff into the .cpp file and formatted the file and I removed recursion from the tuple printer for better compile times and readability.

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.05%. Comparing base (8e4ab5d) to head (2718aec).
⚠️ Report is 5 commits behind head on devel.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #3028      +/-   ##
==========================================
- Coverage   91.08%   91.05%   -0.03%     
==========================================
  Files         202      202              
  Lines        8715     8716       +1     
==========================================
- Hits         7938     7936       -2     
- Misses        777      780       +3     

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[horenmar]

Let's not reformat everything.

As I understand it, there are three separate changes

1. catch_strnlen goes into .cpp
2. Part of time-point stringifier goes into .cpp
3. Tuple does not recurse to print iself.

Can you provide the PR with just these changes? Alternatively I can pick the changes later.

[ZXShady]

Hi sorry, I was away from my computer for this week.