Add a few icons

[MagiX13]

Should close two requests and one new one (streamyfin)

[Donnnno]

Heya, congrats on your first icons.
I did have to change some stuff, so keep this in mind for future commits :^)
Also, check out the docs: https://docs.arcticons.com/contribute/creating-icons

• changed color to white
• changed sizing to fit inside the guidelines
• remade tts_engine icon because it was too cluttered and had fill based shapes.