feat: default install instructions for runtime dependencies

[malept]

Description of Change

Export default install instructions for runtime dependencies (wine, mono), so that they can be used when generating custom wrapperInstructions arguments.

Export WrapperError in the event that a downstream dependency wants to update the error message via an instanceof check in a catch block.

Also do some cleanup around using nullish coalescing operators.

Checklist

• I have read the contribution documentation for this project.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

[codecov]

Codecov Report

Merging #49 (3d9ac49) into main (be28e7a) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   96.10%   96.34%   +0.23%     
==========================================
  Files           5        5              
  Lines          77       82       +5     
  Branches       20       23       +3     
==========================================
+ Hits           74       79       +5     
  Partials        3        3              

Impacted Files	Coverage Δ
src/dotnet.ts	100.00% <100.00%> (ø)
src/exe.ts	100.00% <100.00%> (+10.00%)	⬆️
src/wrapper.ts	93.93% <100.00%> (-6.07%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update be28e7a...3d9ac49. Read the comment docs.