Collision capsule support

[5gTestSubject]

Adds support for capsule shapes constructed similarly to rectangles and ellipses.

Lots of copy/paste work of ellipse support with a little custom work on drawing.

Object Layer

A .tmx snippet of an ellipse and a capsule:

<object id="1" x="159" y="71" width="152.615" height="70.5215" rotation="325.864">
 <ellipse/>
</object>
<object id="3" x="383" y="24" width="146" height="70" rotation="18.187">
 <capsule/>
</object>

Tile Collisions

Left: ellipse. Right: two capsules.
They happen to be in an isometric project.

A .tsx snippet of an ellipse and a capsule:

<object id="1" x="-643.5" y="-442.5" width="110" height="68">
 <ellipse/>
</object>
<object id="2" x="-537" y="-511" width="149.5" height="52.5">
 <capsule/>
</object>

Needs Work

• Icons: Toolbars are currently using the ellipse icons, though they have the correct tooltips. I don't know how these were created and so can't really make one to match.
• Translations: idk how y'all do that.
• Shortcut key: (C was already taken for ellipses 😅)
• There's an ellipse edge-case that may need to be adapted to capsules. Unclear.
• Idk the guidelines on who puts what name in a copyright header.

[5gTestSubject]

Oh! Almost forgot. Discussion on feature: #2153

[bjorn]

That's great, thanks for making this addition! And indeed this really involved mostly minor adjustments to many places in the code and Qt can already draw these shapes so no problem there either.

I think the only remaining thing we need is a fitting icon. I'll try to create one in the style of the other ones.

I've added your name in copyright line for the new files. I think the changes in other files are small enough that it makes little sense to add your name everywhere. I hope that's fine.

Translations files will be updated 1-2 weeks before I make the next release.

I'm also not sure what would make a good default shortcut...

For the edge case, I've opted to also use it there since a 0-width/height capsule is also just a line. We can test later whether this is still an issue today.

[5gTestSubject]

Maybe alt+C would work? There doesn't seem to be an existing expectation of what alt is meant to do and it does make a little sense with how similar ellipses and capsules are.

[bjorn]

Unfortunately we already put Alt+C on a hidden "copy hovered coordinates to clipboard" action. :-)

[bjorn]

Alright, icons are in, docs are updated, NEWS is updated! I think we're ready to merge this, @5gTestSubject?

[5gTestSubject]

@bjorn looks good from my end. Thanks for accepting this! Game devs are gonna be happy.

[bjorn]

@5gTestSubject Thanks again for this contribution! I've opted to put it on Shift+C in the end, which should be still available.