Thumbnails: add HiDpi folders

[Méven]

Hello,

I have been working on adding support for HiDpi thumbnails in KDE
frameworks. [1]

So I'd like to take the high road and update the specification [2]

The crust of my specification update proposal is as follows :

Thumbnails generated with high-dpi (usually using a scale factor of 2)
should be stored in folder using a suffix a @<scale-factor as int>x suffix,
i.e :

$XDG_CACHE_HOME/thumbnails/large at 2x contains up to 512x512 thumbnails with
a scale factor of 2
$XDG_CACHE_HOME/thumbnails/normal at 2x contains up to 256x256 thumbnails with
a scale factor of 2

An additional attribute Thumb::DevicePixelRatio might be added to store the
actual scale factor (as an int).

The @2x suffix is already used in breeze-icons to symbolize 2x scale ratio
resources. [3]

Once I have some traction with the proposal I will submit a merge request
[4].

[1]: https://phabricator.kde.org/D29397
[2]:
https://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html
[3]:
https://invent.kde.org/frameworks/breeze-icons/-/commit/2dcc2b712a88e726f31f3a4732ba2c39c01a2bce
[4]:
https://gitlab.freedesktop.org/xdg/xdg-specs/-/blob/master/thumbnail/thumbnail-spec.sgml

Cheers,

--
Méven Car
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