Allow user to set icon size in settings

[mswiszcz]

This PR allows user to set icon size in settings, making it easier to move from this:

to this:

Here's the new option:

May need some tweaking as I see the icon is not properly centered, not sure though if it's a problem with this or not related.

One commit is optional as Atom automatically removed unused whitespace for me.

Hope you like it 😄

[dscso]

Please add this feature... I have a High DPI screen, and the icons are looking horrible... this fixes it.
Before:

After:

It would be better if the the icon size adjusts automatically like all the others icons do but I don't know how that is possible.
And, thank you all who made this applet.

[jaszhix]

@mswiszcz I forked this project as Icing Task Manager and integrated your pull request as a part of the initial commit.

[mswiszcz]

@jaszhix Good job, there is also Russian translation pending as PR on my repo, you may want to add this also 😉

[jaszhix]

@mswiszcz Thanks, I'll look into the other PRs later this week! One caveat with the icon resizing, I had to restart Cinnamon to see the change. So mileage may vary. I'll dig into the API docs some more and investigate.

[jaszhix]

@mswiszcz Russian translation was added.