cantool/generate: handle mux bool types correctly + skip overflow values

[d4l3k]

This PR does two things:

1. Handles mux bool types correctly (true/false instead of 0)
2. Skips values that will overflow the type of the constant to still allow generating code with bad dbc files

Fixes #39.

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Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 54.80%. Comparing base (436134b) to head (cef29e3).
Report is 163 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
- Coverage   55.20%   54.80%   -0.41%     
==========================================
  Files          62       62              
  Lines        3556     3582      +26     
==========================================
  Hits         1963     1963              
- Misses       1484     1510      +26     
  Partials      109      109              

Files	Coverage Δ
internal/generate/file.go	0.00% <0.00%> (ø)

[hashemmm96]

Hey, thanks for your contribution! Sorry for the late review 🙇

I think this looks good, but there's been some changes to the CI for this project, so let's rebase on master first and see if there's fixes to be made.

[Jassob]

Hello @d4l3k, if this is still relevant please rebase on master and we'll review it again.

Otherwise we will close it in 14 days.