Add jetpack sprite

[def-]

from ddnet/ddnet#12693

[ChillerDragon]

@def- nice thanks, lgtm so far.

Are you planning to generate the game.png file for ddnet/ddnet#12693 from the svg source?

[def-]

Nope, only generated the jetpack from it

[ChillerDragon]

I think it would be good to make sure the alignment is correct

[def-]

The jetpack itself is identical, but all the other tiles are not.

[ChillerDragon]

The jetpack itself is identical, but all the other tiles are not.

Okay fair

[ChillerDragon]

I did not verify if the alignment is correct ._. but we can always fix it later if something is off.

We can merge this as soon as ddnet/ddnet#12693 got merged.