Add hide settings (#9)

[koolskateguy89]

This solves #9, it only makes sense to have settings to hide the runner & percentage right?

• Hide runner: (runcat in the middle)
  

• Hide percentage:
  

[koolskateguy89]

The only problem is that the number on the right of the slider/scale isn't in line with the end of the switches :/

[win0err]

@koolskateguy89, thank you, awesome work!
I'll do some redesign of the settings window, don't worry about it.

I think that we shouldn't allow hiding both runner and percentage. I think it's quite strange.
Maybe it's better to use ComboBox selector?

[koolskateguy89]

Yeah that is definitely a better implementation, I'll work on it in a bit

[koolskateguy89]

I've implemented the comboBox, I had some difficulty making the code very clear, so I included 2 options of how to implement changing settings:

• 2 parallel arrays between strings & functions
• Switch case of comboBox active index then changing settings accordingly

I think the second options is clearer

[win0err]

Switch case of comboBox active index then changing settings accordingly

Agree, it's more clearer

[win0err]

@koolskateguy89,
I'll check that new feature works fine on GNOME 3.34, 3.36, 3.38, and 3.40, and then merge the PR