Use clippy to disallow e/print/ln macros

[SpyrosRoum]

closes #1034

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cd0bb24) 21.99% compared to head (581b14b) 21.99%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1213   +/-   ##
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  Coverage   21.99%   21.99%           
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  Files         154      154           
  Lines       24112    24112           
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  Hits         5303     5303           
  Misses      18809    18809           

Flag	Coverage Δ
wlcs-buffer	18.99% <ø> (ø)
wlcs-core	18.67% <ø> (ø)
wlcs-output	7.75% <ø> (ø)
wlcs-pointer-input	20.83% <ø> (+0.05%)	⬆️

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Files	Coverage Δ
build.rs	80.72% <ø> (ø)

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[SpyrosRoum]

Didn't realize clippy runs with the top level config for anvil and smallvil.

I will switch print to tracing logs for those as part of this PR.

[SpyrosRoum]

Ended up allowing print for usage messages in smallvil, I think it makes more sense to print help messages like that.

However if you think I should change them to tracing logs let me know

[Drakulix]

LGTM! Thanks. :)