Better contrast icons in torrent list

[Pentaphon]

Currently, the seeding icon is a low-contrast icon on the light and dark modes. It's hard to tell what it is even is in either mode.

Perhaps a simpler, high contrast set of icons can be used to show the current state?

[equeim]

Hmm. The idea is to differentiate between torrents that are being actively downloaded/uploaded from those that are just sitting there. I'm not sure how beneficial is this, but I find this useful.

I'm not sure I have enough skill to make a new ones (I just stole them (legally) from old version of qBittorrent in the first place). Maybe making arrow brighter will improve this (I might as well remake them in svg, it's needed for hidpi).

[Teloriun]

Reading this gave me some flashbacks to uTorrent where you could download and replace the status and toolbar icons with your own creations (maybe a bit dated having them in .bmp but worked well). Don't know if something like this would work, then if people don't like the provided version, they could use their own?

toolbar

torrentstatus

[Pentaphon]

@equeim huge improvement with that commit but I have to say the "active" icon still has a contrast issue where it's green on purple and it just doesn't look as good as the other icons. Do you think you can find a better icon for "active"? Maybe the green play button should have a green outline similar to the "downloading" icon? The purple really conflicts with the green and that's the only purple you see in the entire application.

55272ad#diff-cf7cde5286b65baf8a282b83a7ccf0b8003e3693f72da6c796209315cc673330

This is the icon I think needs to be changed. The green on purple really doesn't work.