RFE: Add GAs CD insert option/visibility in the status bar

[Socratis]

Current State of affairs

Clicking on the CD icon in the status bar, you're presented with

Choose disk image...
Create ad-hoc VISO...
------------------------------------------
{list of previously used CDs/DVDs}
------------------------------------------
Remove disk                               <-- greyed-out if no CD/DVD is inserted

There's nowhere a mention of the GAs, whether they're inserted or not! Even worse, when the GAs are mounted, they don't appear anywhere on the list of used CDs.

Proposed State of affairs

When the GAs ISO is not inserted/mounted:

Choose disk image...
Create ad-hoc VISO...
(Insert) Guest Additions CD image...      <-- *** NEW ENTRY ***
------------------------------------------
{list of previously used CDs/DVDs}
------------------------------------------
Remove disk                               <-- greyed-out if no CD/DVD is inserted

When the GAs ISO is inserted/mounted, option 1:

Choose disk image...
Create ad-hoc VISO...
(Insert) Guest Additions CD image...      <-- *** CHECKED ***
------------------------------------------
{list of previously used CDs/DVDs}
------------------------------------------
Remove disk                               <-- NOT greyed-out

or even better, option 2:

Choose disk image...
Create ad-hoc VISO...
Remove Guest Additions CD image           <-- *** s/Insert/Remove ***
------------------------------------------
{list of previously used CDs/DVDs}
------------------------------------------
Remove disk                               <-- NOT greyed-out

So, in summary:

• The whole menu's behavior stays as is, except with the addition of one menu entry.
• The menu can either be mimicking the Devices menu entry "Insert Guest Additions CD image..." which changes to "Remove Guest Additions CD image", or with the entry being simply "Guest Additions CD image..." which is either checked or not.