Possible reference to MediaItem schema added.

[alexruperez]

In order to try to generate mocks #88 of each server response, I have redefined MediaItem schema as a possible reference.

[yonaskolb]

Thanks @alexruperez! Could you add a changelog entry as well

[alexruperez]

Thanks @yonaskolb, I always forget something! 😅 Done! 🙌

[yonaskolb]

@alexruperez this seems to have broken the fixtures. When this PR ran on CI, it didn't fail when it failed to compile the fixtures. I've fixed that so now the errors are properly reported, in the ci branch (also moved to github actions)
Test results can be seen here https://github.com/yonaskolb/SwagGen/runs/582688905?check_suite_focus=true

[alexruperez]

Exactly the same error that is happening in #240, it's the Rocket fixture, but I don't know how to fix it. 😞

[yonaskolb]

Rocket is the only one not compiling, but the others are broken too I believe. If you look at the diff of this PR there are lots of useless inline models being generated

[yonaskolb]

@alexruperez this PR seems to have broken things. I'll need to revert it