Remove core::except completely

[ken-matsui]

No description provided.

[codecov]

Codecov Report

Merging #360 (74335d3) into master (337d32b) will decrease coverage by 0.07%.
The diff coverage is 60.24%.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
- Coverage   78.55%   78.48%   -0.08%     
==========================================
  Files          54       52       -2     
  Lines        2453     2445       -8     
==========================================
- Hits         1927     1919       -8     
  Misses        526      526              

Impacted Files	Coverage Δ
include/poac/util/net.hpp	12.04% <0.00%> (+0.07%)	⬆️
tests/standard.cpp	100.00% <ø> (ø)
include/poac/util/misc.hpp	58.82% <50.00%> (+3.26%)	⬆️
include/poac/core/builder/standard.hpp	66.43% <68.57%> (-0.93%)	⬇️

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