[dev] Ansel direct gallery naming

[Duck]

I tasted Ansel on a small project and comes out that the gallery naming (the 
creation of the unique id) is hard to understand for an general user. Since 
we allwaysuse gallery tile an ask for the unique id only when we create it. 
So I changed the "autoname" pref from shackto enum to allow selecting 
autonaming without prompting for the auto generated id.

Duck
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