Add "Sales Suspension" feature

[mlocati]

Close #781

[Mesuva]

I've merged this and I'm having a look.

I really like this idea, the only pause I have is that there already is a similar (but simpler) feature under 'Cart and Checkout', where you can put it into 'Catalog Mode'.

They serve slightly different purposes though (and yours is much more featured), so I'm just thinking through whether the features should be combined

[mlocati]

Yep, they both turn off selling items. Here's what we can do:

1. in the upgrade method, check if we are upgrading from a version older than the one that introduces this new feature: in this case, set the community_store.salesSuspension.suspend configuration key to the value of community_store.shoppingDisabled
2. remove the select that contains "Disabled (Catalog Mode)" in the "Cart and Checkout" section
3. in the new "Sales Suspension", we can:
   1. change the select, so that it presents these options:
      • Sales are active (pre-selected if community_store.salesSuspension.suspend is false)
      • Sales are disabled (catalog mode) (pre-selected if community_store.salesSuspension.suspend is true and start/end dates are both null)
      • Sales are temporarily disabled (pre-selected otherwise)
   2. if the first or the second option are selected, we don't display the date/time pickers for start/end dates
   3. when saving: community_store.salesSuspension.suspend is false if the first option is selected, true otherwise

[mlocati]

If that's ok for you, I can of course submit a PR with these changes

[Mesuva]

Of course, all your help here is immensely appreciated.

I agree with the approach you've outlined.

[mlocati]

And here's the PR: #793