server: SàT applications integration: - a SàT Application can be added to the menu (if necessary values are exposed), by using the `sat-app:[application_name]` in `menu_json` or `menu_extra_json`. The application will then be started with Libervia, and embedded, i.e. Libervia menu will appear and application will be integrated under it. - the same `sat-app:[application_name]` thing can be used in redirection, in this case the redirection will reverse proxy directly the application, without embedding it (no Libervia menu will appear) - the ReverseProxy will replace headers if necessary to allow embedding in a iframe from the same domain - new `embed_app` page to embed a SàT Application

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732ed69ffe11a5116dc9f8e0b084d47cc3f5a658 SàT v0.3.0
f2c380af7304d65703cf2f88882d08b4236fd36e SàT v0.4.0
ff03fdb5215d31e65123da6646589f9393fcd929 SàT v0.5.0
9b217e14fc6a515902a66f719f3131250e83ea56 SàT v0.5.1
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