Revert "Use traits implemented for all Uint/Int types"

[tarcieri]

This reverts commit f268e8d (#1008)

See discussion on #1008 for context

[codecov]

Codecov Report

❌ Patch coverage is 90.52133% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.87%. Comparing base (44ead85) to head (35562e2).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/traits.rs	0.00%	7 Missing ⚠️
src/uint/macros.rs	83.33%	6 Missing ⚠️
src/uint/boxed/div.rs	0.00%	3 Missing ⚠️
src/uint/encoding.rs	93.54%	2 Missing ⚠️
src/uint/mul.rs	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1015      +/-   ##
==========================================
+ Coverage   79.85%   79.87%   +0.02%     
==========================================
  Files         162      163       +1     
  Lines       17575    17593      +18     
==========================================
+ Hits        14035    14053      +18     
  Misses       3540     3540              

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[Fethbita]

@tarcieri, could you re-open #793 since this was reverted?

[tarcieri]

We should probably reopen an issue, but I don't think #793 is the right one, unless @fjarri has another idea for a design. Otherwise I'd say we tried that and it didn't work out, at least given the current limitations of the Rust type system.

[Fethbita]

Makes sense, maybe #228?

[tarcieri]

@Fethbita I'm curious if we can find a solution for what you want to do which doesn't involve having to add a bunch of bespoke sizes