Hey, thanks for this PR. I've rebased to latest, and pushed a new commit with some changes to the rust c header. Firstly, do you think the approach is on the right track? Secondly, if you agree with the direction would you mind updating the Velopack.hpp c++ header to align with the new C functions?

To summarise,

• There are now new API's for creating sources (eg. vpkc_new_source_file, vpkc_new_source_http_url, vpkc_new_source_custom_callback)
• These sources, once created, can be passed into vpkc_new_update_manager_with_source.
• Progress (during downloads) can be reported back to velopack via vpkc_source_report_progress

I've not tested these changes yet.

Codecov Report

Attention: Patch coverage is 0% with 162 lines in your changes missing coverage. Please review.

Project coverage is 37.34%. Comparing base (8ac4f68) to head (4e2ffde).
Report is 6 commits behind head on develop.

@@             Coverage Diff             @@
##           develop     #401      +/-   ##
===========================================
- Coverage    47.05%   37.34%   -9.71%     
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  Files          223       51     -172     
  Lines        13673     5992    -7681     
  Branches      1251        0    -1251     
===========================================
- Hits          6434     2238    -4196     
+ Misses        6906     3754    -3152     
+ Partials       333        0     -333     

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@caesay Sorry, I just saw this. I guess you made reasonable choices? Please let me know if you'd like me to do anything more. Glad that the change is in main!

The changes have been released, and there is an example in the CPlusPlusWidgets sample. Could you please review/test that the final implementation is suitable? It is available in the latest release, so you can just download a pre-built from there.

I integrated with our app and tested it. It works as intended.