[epiphany] (7 commits) ...Add mute and unmute items to the tab context menu

[Michael Catanzaro <mcatanzaro src gnome org>]

Summary of changes:

  b63ec45... notebook-context-menu: Hide pin actions when disabled (*)
  160a1a6... notebook-context-menu: Use the same mnemonic for pin action (*)
  5dae76a... window: Merge tab.close and tab.close-tab (*)
  f1e04bf... window: Merge app.reopen-closed-tab and tab.reopen (*)
  432d608... window: Merge toolbar.reload and tab.reload (*)
  b7f5061... window: Remove tab.detach action (*)
  b382897... Add mute and unmute items to the tab context menu (*)

(*) This commit already existed in another branch; no separate mail sent