Difficult to read when using text only

[k8ieone]

Issue description

This is not a bug report. It's more of an improvement suggestion. So I'll skip some of the items here.
This is also a duplicate of #85 except maybe a little more useful.

After setting the applet not to use icons, the output becomes very ugly. Almost difficult to read. Take a look:

With icons, this looks fine to me:

This is labels and values:

and this is just values:

It looks a bit better after disabling showing units:

It becomes this big blob of text that is hard to navigate with eyes. There should be a clear separation between labels and values. The individual sensors should also have a bigger gap (perhaps even a configurable one).
Another thing I noticed is that the unit really doesn't have to be shown. The user most likely knows if they set it to F or C. So instead of showing °C or nothing, how about showing just the ° symbol?

As a reference, here's Plasma's thermal monitor:

There's another thing that could be improved, but I think I'll open another issue for that. It's about making a group of sensors and calculating either the average or picking the hottest/coldest one. Very useful for many-core CPUs. This is also very close to what Plasma does.

System info

Distro: Arch Linux
MATE version: 1.24
Package version: 1.24.1-1

I haven't found any bug report in Arch's bug tracker.

[lukefromdc]

This is confirmed-and it didn't always have this problem. In fact, when I first switched from Cinnamon to MATE there was a space between each sensor's value and we no longer get that. Not sure if this was a problem with my early GTK3 port or it came in later