Follow up for #1951268: Convert /forum and /forum/% to new routing system, convert Forum to subclass Term entity type
Problem/Motivation
Once #1951268: Convert /forum and /forum/% to new routing system, convert Forum to subclass Term entity type is in we can convert /forum and /forum/% to use an entity render controller
Proposed resolution
Create \Drupal\forum\ForumRenderController to generate the render array for /forum and /forum/%
Remaining tasks
Write patch
Get #1951268: Convert /forum and /forum/% to new routing system, convert Forum to subclass Term entity type reviewed
User interface changes
None
API changes
forum_get_topics() moved to the storage controller