We need to go through all usage of ED_workspace_status_text and ED_area_status_text and make it use the new convention:

• The statusbar shows keymaps, with the new keymap drawing with icons.
• Area header shows values and state being edited, so it's close to where the user is looking.

Some example issues:

• Knife shows mixed keymap and state text in the status bar, should be split up.
• Transform operator shows a long list of keymap items, could be organized to show fewer.