Add Center View button to 2D editor

[KoBeWi]

Does the same as pressing F shortcut.

Helps #47628

[YeldhamDev]

Too detailed for its size. It would be better for the icon to be the same as the "Move Mode" (shown in the screenshot), but with the arrows reversed.

[KoBeWi]

It's the same as in tile editor though.

[YeldhamDev]

It's the same as in tile editor though.

Then it should likely be changed there too.

[KoBeWi]

CC @groud

[groud]

Hmm, I am not against it, but well, it's only useful when you disable the constrained scrolling area IMO.
And, TBH, I still think constraining the working area is better.

To solve the initial problem, we could maybe extend the constrained area to 2 or 3 screen size something like that. That could be a good in-between solution I guess.

[YuriSizov]

Can you rebase it? I would be in favor of merging this. While in here Gilles says it's only useful when we remove constraints, in #47628 he makes a valid point that people may not find it easy to find the shortcut for this action. So IMO the button is justified regardless.

[YuriSizov]

Thanks!