Merge pull request #4541 from marc1706/ticket/9590
[ticket/9590] Submit permissions form in chunks
* marc1706/ticket/9590:
[ticket/9590] Correctly update submit size and replace all forum_id[]
[ticket/9590] Further deduplicate code for form data
[ticket/9590] Preserve selected forums after previous page redirect
[ticket/9590] Support ajax submit of permissions for specific forums
[ticket/9590] Correctly set roles and refresh page using POST
[ticket/9590] Submit permissions form in chunks when using "Apply all"
