Files: Support changing folder icons

[codygarver]

Support changing folder icons.

Bounty: https://www.bountysource.com/issues/21220585-possibility-to-change-folder-icons-15

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[aljelly]

In addition to (or instead of?) being able to choose folder icons for user folders, it would also be really cool if you could show it as a sort of "badge" on top of the default folder icon. Here's a mockup:

(The icon and border in the mockup is not perfectly square, it's about 1px less wide, it should be 32px x 32px)

Basically a custom icon positioned over the default folder icon. For the folder icon size shown in the mockup, 32px x 32px would be an appropriate size for a badge icon. The badge sizes for other folder icon sizes would probably need to be considered.

For the smallest sizes where the special folder icons (Documents, Music, Videos etc.) turn into symbolic icons (like a piece of paper, a musical note, film), you could show the badge icon as the icon for the folder.

(This is 200% a wishlist addition and shouldn't be made a priority at all.)

[Vento09]

It could be like webpin. When we were to open the properties of the folder, you could have the option to change the folder icon like this:

(The image was not good but what matters is the intetion)

It could be possible with archives also, mainly with .appimages archives