Macroize feature printing to ensure we don't miss new flags

[TheBlueMatt]

No description provided.

[codecov]

Codecov Report

Merging #1020 (1f013c9) into main (1bb9e64) will decrease coverage by 0.02%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main    #1020      +/-   ##
==========================================
- Coverage   90.81%   90.79%   -0.03%     
==========================================
  Files          60       60              
  Lines       31428    31434       +6     
==========================================
- Hits        28542    28541       -1     
- Misses       2886     2893       +7     

Impacted Files	Coverage Δ
lightning/src/ln/features.rs	99.43% <92.30%> (-0.28%)	⬇️
lightning/src/ln/peer_handler.rs	45.98% <100.00%> (-0.47%)	⬇️
lightning/src/ln/functional_tests.rs	97.28% <0.00%> (-0.10%)	⬇️

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[jkczyz]

ACK 1f013c9

Was thinking we could use this lol

[TheBlueMatt]

Yea lol, I hacked it up to see if I had peers that wouldn't like #1018.