[WIP] Add basic support for SourceForge

[swissspidy]

Because we can 🤷‍♀️

SourceForge supports Git, Mercurial, and Subversion. All at once or none at all. That means people will still need to hook into traduttore.loader to choose the correct source code loader.

[codecov-io]

Codecov Report

Merging #77 into master will increase coverage by 0.42%. The diff coverage is 87.17%.

@@             Coverage Diff              @@
##             master      #77      +/-   ##
============================================
+ Coverage     78.05%   78.47%   +0.42%     
- Complexity      333      347      +14     
============================================
  Files            23       24       +1     
  Lines           802      841      +39     
============================================
+ Hits            626      660      +34     
- Misses          176      181       +5

Impacted Files	Coverage Δ	Complexity Δ
inc/LoaderFactory.php	100% <ø> (ø)	4 <0> (ø)	:arrow_down:
inc/WebhookHandlerFactory.php	100% <100%> (ø)	6 <0> (+1)	:arrow_up:
inc/WebhookHandler/Base.php	100% <100%> (ø)	12 <0> (+2)	:arrow_up:
inc/RepositoryFactory.php	87.09% <20%> (-12.91%)	14 <0> (+2)
inc/WebhookHandler/SourceForge.php	96.55% <96.55%> (ø)	9 <9> (?)

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[swissspidy]

Is there a reason why this is not failing the tests?

Which ones should fail in your opinion? I didn't add any loader tests for this one (because of the manual involvement) and existing ones shouldn't be affected. Plus, existing loader tests are currently skipped anyway.

[grappler]

I didn't add any loader tests for this one (because of the manual involvement)

Ok, that makes sense now.

[swissspidy]

Do you have a repo that we can use to test that it is working?

I've set up https://sourceforge.net/projects/pascals-test-project/ but with no webhooks configured yet. It's on my todo list :-)

I also have two GitLab repositories that I still want to properly test for #61.