One page picker

[Thatoo]

Thanks to @nextcloud/dialogs v5.3.5 and @nextcloud/vue v8.15.0 it is now possible to build picker window with several button having each one its own action.
This is why i propose to make the choice between read and write directly on the front page to gain one step.
I also merged (and adapt) my work from #38 to give the option to have either one window that open files or one window (depending on an url parameter : ?option=Clipboard) that copy one of the three link (read, write or internal) into the Clipboard.

Everything is working as expected!

I just can't make icons to be displayed. Colors of button are just for trying.

[Thatoo]

I ask about this icon not displaying issue in here nextcloud-libraries/nextcloud-dialogs#1403 so I'm hopeful it will be solved.

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[Thatoo]

it's working now.

I'll cleanup my PR and make a new one. Then only translation will remain.