Add an id_accessor property to TitleColumn
Add an id_accessor property to TitleColumn

This allows the linked instance to be something that doesn't expose a `.pk` property, like a dict from a DRF response, while keeping the `get_link_url` mechanism

zerolab/wagtail,wagtail/wagtail,rsalmaso/wagtail,thenewguy/wagtail,rsalmaso/wagtail,thenewguy/wagtail,zerolab/wagtail,rsalmaso/wagtail,wagtail/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,zerolab/wagtail,zerolab/wagtail,wagtail/wagtail,thenewguy/wagtail,thenewguy/wagtail,zerolab/wagtail,wagtail/wagtail,wagtail/wagtail,thenewguy/wagtail