Improve array comparison during import

[boudewijn-zicht]

Two more PR's that improve how values are compared to reduce the updates done during import

#1237
#1236

[kristiansp]

I also have a really old pull request that's kind of related, to sort arrays before comparing, as otherwise it will always update if the elements are in a different order. Could maybe be combined.

#735

[kristiansp]

Another unrelated and simple pull request regarding performance, with the hope that it will be seen – checking if an element is already disabled before disabling it, avoiding to uneccessarily save them again (I have the need to update elements that might be enabled later under certain circumstances, and can't see it could hurt not to disable something that is already disabled).

#736

[angrybrad]

Resolved on develop branch.