Svgo optimization

[skjnldsv]

Big optimisation of all svg with svgo

Stats:
Old size: 177.536Ko
New size: 101.352Ko
Size reduced by: 44,49%

Not sure if really necessary. Did it in 30sec.

find -name "*.svg" -exec svgo {} \;

Only the /core/img/desktopapp.svg is not worth optimising.

[mention-bot]

@skjnldsv, thanks for your PR! By analyzing the annotation information on this pull request, we identified @blizzz, @paurisa, @rullzer and @Xenopathic to be potential reviewers

[nickvergessen]

Same here, to make tests pass, see #1535 (comment)

[skjnldsv]

@nickvergessen Rebased with signature :)

[MorrisJobke]

I tested this especially with Firefox because there we had the biggest problems with SVGs. Works fine 👍

[LukasReschke]

Clicked around in Safari and all seemed fine 👍

[jancborchardt]

@skjnldsv this caused big issues with lots of source files: #4076 it would be good if we can revert that and use Scour instead of Svgo, as we did so far without issue.