Added referral url and change layout option

[girishpanchal30]

Summary

Added referral URL and layout change option, and moved cache time and sorting order option inside advanced panel.

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Closes https://github.com/Codeinwp/feedzy-rss-feeds-pro/issues/911

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[Soare-Robert-Daniel]

@ineagu, with this PR, we have 2 methods to replace the layout.

Should we keep both or just one of them? And which?

Method 1. Via Replace, which pops up a modal with a rendered layout

Method 2. Sidebar Selector (added in this PR)

[ineagu]

we should use method 2, presented here but week the layout picked on 1 line with smaller icons, aligned horizontal instead vertical.

Also the layout won't get a separate tab, but be present in settings, which would be the first one, referral tab would got before advanced at the end.

[girishpanchal30]

I have aligned the layout options and moved the referral tab before the advance tab.

[Soare-Robert-Daniel]

I updated the design to be minimal and less distracting

[Soare-Robert-Daniel]

@girishpanchal30 this was not necessary bdb55f3, your idea with passing the $attributes along is good (I also updated my other PR based on this)

[girishpanchal30]

@Soare-Robert-Daniel Okay, I will revert the changes of bdb55f3

[Soare-Robert-Daniel]

@girishpanchal30 no need it, I found a better one, we already had a built-in mechanism for referral_url

[Soare-Robert-Daniel]

I will merge this. Seems to work fine. Any issue will be solved in the Release PR.

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