improve trace messages / warnings & add color #866

[tfranzel]

resolves #866
supersedes #868

@HansAarneLiblik please review this alternate proposal. Also not that you can use --color on the CLI.

[codecov]

Codecov Report

Base: 98.67% // Head: 98.79% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (aec3708) compared to base (0570b70).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #889      +/-   ##
==========================================
+ Coverage   98.67%   98.79%   +0.11%     
==========================================
  Files          66       68       +2     
  Lines        7726     8108     +382     
==========================================
+ Hits         7624     8010     +386     
+ Misses        102       98       -4     

Impacted Files	Coverage Δ
drf_spectacular/contrib/django_filters.py	89.70% <100.00%> (ø)
drf_spectacular/drainage.py	99.20% <100.00%> (+0.23%)	⬆️
drf_spectacular/generators.py	98.01% <100.00%> (ø)
drf_spectacular/management/commands/spectacular.py	96.15% <100.00%> (+0.23%)	⬆️
drf_spectacular/openapi.py	98.42% <100.00%> (+0.85%)	⬆️
tests/test_command.py	100.00% <100.00%> (ø)
tests/test_warnings.py	100.00% <100.00%> (ø)
tests/test_fields.py	100.00% <0.00%> (ø)
drf_spectacular/__init__.py	98.30% <0.00%> (ø)
drf_spectacular/extensions.py	100.00% <0.00%> (ø)
... and 1 more

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