Rename SS_List to ListInterface

[emteknetnz]

SS_List is the sole archaically named class/interface from Silverstripe 3 when there were 42 classes and 4 interfaces prefixed with SS_. I think the rational behind the prefix was there we no namespaces back in those days and using an underscore was a way to make quasi namespaces.

I'm not sure why this particular interface wasn't renamed to get rid of the SS_ prefix, possibly because of a risk of a collision with a potential php reserved List class or the list() function, or maybe because it was simply missed

I think we should simply rename it to ListInterface to avoid any potential collision. Suffixing with Interface isn't ideal though it's also not completely out of line with Silverstripe naming:

Doing a quick search is sink in vendor/silverstripe/**/*.php

^interface .*Interface = 46 matches
^interface = 171 results

While we're doing also rename any SSList* classes to remove the SS prefix, e.g. SSListExporter to simply ListExporter:

Related issues

• Roll filterable, sortable, and limitable into SS_List interface #8778

Acceptance criteria

• SS_List is renamed to ListInterface
• SSList* classes are renamed to remove the SS prefix