Adding icons and symlinks for full colour tick and cross actions

[ubuntujaggers]

As @madsrh notes, we will likely be changing the icon itself to match new colours, but this PR has all the symlinks etc. for testing. If it works in Ubiquity we can consider whether to include the symlinking of the dropbox emblems in this PR too. Fixes #1686 .

[Feichtmeier]

Awesome Stuart!
This will be a bit tricky to test since the page with the entries comes after you partitioned some drive :D
I'll try with an usb stick

[Feichtmeier]

Should we eventually exchange the icons with these two?
#1686 (comment)

@madsrh @ubuntujaggers

[ubuntujaggers]

Should we eventually exchange the icons with these two?
#1686 (comment)

@madsrh @ubuntujaggers

Done and pushed.

I've not touched the corresponding folder emblems yet - I think that's a different PR where we look at all the emblems (for instance: recolour all of them and make the glyphs less hairline to match these two?).

[Feichtmeier]

@ubuntujaggers thanks! I don't find a way to test this except creating a new VM since those fields only come after you partioned your disk (in the installer)
Maybe you could double check if you did everything correctly from your perfection and then merge it?
This can not really break anything and we are in the dev cycle so enough time to fix