Use the new logging interface throughout

[lhchavez]

No more explicit references to log15! #minor

[codecov]

Codecov Report

Merging #17 (cf83c14) into main (81c647d) will increase coverage by 1.64%.
The diff coverage is 55.96%.

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   53.10%   54.74%   +1.64%     
==========================================
  Files           7        8       +1     
  Lines        2000     2331     +331     
==========================================
+ Hits         1062     1276     +214     
- Misses        730      831     +101     
- Partials      208      224      +16     

Impacted Files	Coverage Δ
server.go	22.18% <19.20%> (+0.65%)	⬆️
browser.go	51.55% <44.44%> (-0.87%)	⬇️
protocol.go	62.50% <63.44%> (-0.49%)	⬇️
keyedpool.go	78.12% <78.12%> (ø)
commits.go	61.12% <93.47%> (+3.08%)	⬆️
packfile.go	55.12% <100.00%> (ø)

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