Better memory and storage info

[vjr]

Stolen code from GNOME settings repo to use UDev and UDisks libraries to get more accurate memory and storage info.

Memory now shows the physical RAM capacity and storage code collects the total size of all non-removable and non-ejectable disks.

Before: (note the non-physical RAM size using glibtop.mem library and storage size of the root partition only)

After: (note the more accurate physical RAM size and storage size of the physical disk)

[vjr]

I'm not sure how to fix the missing dependency error in the build stages... @elementary/desktop-developers

[vjr]

Here's what it looks like on my laptop - notice the disk size isn't rounded off but still acceptable IMO.

Before:

After:

[zeebok]

I'm not sure how to fix the missing dependency error in the build stages... @elementary/desktop-developers

I believe you need to add those dependencies to the github workflow yml files