Draft: Port to GtkColumnView

• Port proctable to GtkColumnView.
  • List view.
    • Insert processes.
    • Remove processes.
    • Refresh list.
  • Dependencies view.
    • Insert processes.
    • Remove processes.
    • Refresh list.
  • Search.
  • Filtering.
  • Right-click popover.
  • End process/es button visibility on selection change.
• Port disks to GtkColumnView.
• Find a replacement for GsmTreeView (We cannot derive a subclass of GtkColumnView, as with GtkTreeView, since it is a final class).
• Restore commented code.

Documentation

Screenshots

Initiatives#49

Fix #40 Fix #308