Add Nextcloud support

[tobiasKaminsky]

No account found:

Choose between clouds:

Show existing (nextcloud) accounts:

Add account dialog:

[ramschmaerchen]

First of all, thanks for the PR. We will merge after testing.

[tobiasKaminsky]

If you need some changes, please do not hesitate to ask for it :-)

[ramschmaerchen]

Thanks, good to know!

I, or a colleague, will test the following (hopefully) next week:

• Compiling
• Syncing
• Deleting
• What happens when multiple accounts (oc AND nc) are present (IMPORTANT!)

[jancborchardt]

Any update here @ramschmaerchen? :) We could do a call for testing through the @nextcloud twitter. :)

[tobiasKaminsky]

@ramschmaerchen any updates on this?

[duxovni]

This PR is 3 months old, any ETA for when it'll get tested and merged? This is the one thing preventing me from being able to use this app...

[Gomez]

@ramschmaerchen any updates? Maybe consider moving repo and account to nextcloud?

[mokkin]

@ramschmaerchen Is there any further testing needed? I would appreciate having nextcloud support too.
If you don't have enough time atm we could follow @Gomez advice to move the repo to nextcloud itself directly.

[tobiasKaminsky]

If it is moved to nextcloud repo the app still needs devs to maintain it and the android devs from nextcloud (I am one of them) cannot support this at the moment.