Update HTTP Upload to `urn:xmpp:http:upload:0`

Gajim's HTTP Upload currently uses legacy urn:xmpp:http:upload namespace.

XEP-0363 was updated (Version 0.3.0 on 2017-02-01) with a versioned namespace - urn:xmpp:http:upload:0 and the ability for a PUT slot to have headers (like Authorization). This allows passing tokens in headers instead of URLs that could be visible in server logs.

It would be prudent to check existing server components for support. Prosody's modules support both namespaces.

Conversations supports only :0 namespace since January 2018.

Edited Apr 20, 2018 by Wiktor

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