Refactor key list state handling

• State is now stored in a state config instead of a normal config
• Columns are now stored under a UUID instead of their ke
• Order of views is stored in an extra key instead of implicitely by

sorting by name

• Main key list and certificate selection dialog views are stored in

the same file

• Added migration logic to adapt to the new format

(cherry picked from commit 146086631b96240f965d0d3f27dc28481c008ab5)