Refactor media upload

Use Upload Media logic from Pleroma

Backend changes for picture upload

Move AS <-> Model conversion to separate module

Front changes

Downgrade apollo-client: https://github.com/Akryum/vue-apollo/issues/577

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

.gitignore

@@ -28,6 +28,8 @@ priv/data/*
 !priv/data/.gitkeep
 .vscode/
 cover/
+test/fixtures/image_tmp.jpg
+test/uploads/
 uploads/*
 !uploads/.gitkeep
 .idea