Copy system info to clipboard

When reporting issues it's usually important to include system information. It would be quite useful if we could include a button that would copy "relevant" system info in text only form to the clipboard.
Maybe it's even possible to add this as an action to the Applications menu, like "Screenshot of a Selected area"
An example of what that content might be is what neofetch outputs:
```
$ neofetch
eeeeeeeeeeeeeeeee peteruithoven@xps
eeeeeeeeeeeeeeeeeeeeeee -----------------
eeeee eeeeeeeeeeee eeeee OS: elementary OS 0.4.1 Loki x86_64
eeee eeeee eee eeee Model: XPS 15 9550
eeee eeee eee eeee Kernel: 4.4.0-112-generic
eee eee eee eee Uptime: 16 hours, 25 mins
eee eee eee eee Packages: 3098
ee eee eeee eeee Shell: bash 4.3.48
ee eee eeeee eeeeee Resolution: 3840x2160
ee eee eeeee eeeee ee DE: Pantheon
eee eeee eeeeee eeeee eee WM: Mutter(Gala)
eee eeeeeeeeee eeeeee eee Terminal: pantheon-termin
eeeeeeeeeeeeeeeeeeeeeeee eeeee Terminal Font: Roboto Mono 10
eeeeeeee eeeeeeeeeeee eeee CPU: Intel i7-6700HQ (8) @ 3.500GHz
eeeee eeeee GPU: NVIDIA GeForce GTX 960M
eeeeeee eeeeeee GPU: Intel HD Graphics 530
eeeeeeeeeeeeeeeee Memory: 7444MiB / 32038MiB
```

My personal suggestion:
```
OS: elementary OS 0.4.1 Loki (Built on "Ubuntu 16.04.3 LTS")
Kernel: 4.4.0-112-generic
Widget toolkit: GTK+ 3.18.9
Desktop environment: Pantheon
Window manager: Mutter (Gala)
Shell: bash 4.3.48
Terminal: pantheon-termin
CPU: Intel i7-6700HQ (8) @ 3.500GHz
GPU: NVIDIA GeForce GTX 960M
Memory: 32 GB
Storage: 856,1 GB
```