Added ability to pin folders to start

[winston-de]

Closes #782

Tile assets are generated using the Win2D library from the FolderIcon2Large.svg asset and stored in the app cache.
Icons for folders (if there is one) is obtained from GlyphHelper.GetItemIcon. Segoe Fluent Icons are used if they're present on the system, if not Segoe MDL2 Assets are used instead.

Menu items for pinning:

Feedback is appreciated :)

[yaira2]

@winston-de Looks good! A couple of changes I would suggest

• Use the regular folders instead of adding the Fluent UI glyphs on top
• Only show the pin to start menu option when the user opens the menu when pressing down on the shift key

[winston-de]

@yaichenbaum May I ask why not the glyphs? In my opinion it makes it much easier to quickly identify items, especially when they're in a folder or are small tiles.
Windows explorer does something similar as well:

[yaira2]

@winston-de The glyphs look a bit out of place on the fluent icon, we are also working on some custom icons that might look better here.

[winston-de]

@yaichenbaum Alright, I made the changes requested. I do hope something similar to the glyphs can be implemented in the future, as I think having some sort of icon is really useful :)

[d2dyno1]

@winston-de Some 🔥 ideas for icons:

(Source: https://www.youtube.com/watch?v=sLib5QX9qMw&t=50)

[winston-de]

@d2dyno1 That should be made into its own issue as it looks like the icons are not happening this PR.

[R3voA3]

Nice icons, except the one for documents. Isn't there an icon from editor or Wordpad we could use?

[yaira2]

@winston-de What assets are you using in the end?

[winston-de]

@yaichenbaum
https://github.com/winston-de/Files/blob/PinFoldersToStart/Files/Assets/tile-0-300x300.png
https://github.com/winston-de/Files/blob/PinFoldersToStart/Files/Assets/tile-0-250x250.png