Added some sync related options

[ReimuNotMoe]

Hi, I've added some sync related options to let us choose whether we want to sync from local to remote, remote to local, or two-way. We can also choose whether we want to sync deletions.

I'm not sure that my understanding of how the sync code works is 100% correct, but it works.

Comments and suggestions are welcomed.

[MariusBluem]

Hey @ReimuNotMoe, sorry that nobody has answered you on this pull request. The problem with this Windows Universal app is, that it is not maintained by us directly, but by some awesome volunteer developers and community contributors. It was nothing personal from our side 😅

As you may know Windows 10 Mobile is EOL starting end of 2019 (https://www.theverge.com/2019/1/18/18188054/microsoft-windows-phone-windows-10-mobile-end-of-support-updates). I think this may be the reason why nobody here is putting larger efforts in supporting and enhancing it.

I've seen that you have created a fork called "NextCool" and published it into the Microsoft Store. This fork seems to be compatible not only to mobile devices (Windows 10 Mobile) and I am able to run it on my Windows 10 Desktop x86-version which is an awesome enhancement 🙌

I'd love to hear about your plans with this app and maybe we can find a way working together here - releasing NextCool as Nextcloud again and merging the community efforts.

You can contact me via email (marius@nextcloud.com) to discuss this :) Thank you!

[SunboX]

Hey,

sry for being so late. 😢 I've some personal stuff that eats up all my time. I would happily give this project to an active maintainer. It's also fine to me, to move the Nextcloud app in the Microsoft App Store to a new owner!

Some days ago I got also a short email from someone who's interested in continuing this project. But he did not give much details. His name was Gerald.

Please let's discuss the detail by mail: mail@andrefiedler.de

[DecaTec]

Shouldn't we put a hint in the readme.md that this project is looking for a new maintainer?

[MariusBluem]

Shouldn't we put a hint in the readme.md that this project is looking for a new maintainer?

We have 2 possible candidates for maintaining. Lets discuss this with them before doing this.

[jp-weber]

When someone takes over the maintaining, I made a fork of this project for WP8.1 (hobby) and made many improvements and would like to share my fork if there is interest.

The whole project is now switched to Prism 7.2 preview and Template 10 (fork).
So I implemented an image viewer like the owncloud app; a behavior that saves the last position of the scrollviewer of the listview, so that the last position is restored when navigating back, etc.