core/itemimagegrab: ItemImageGrab component

[soramanew]

Adds a custom QML component ItemImageGrab which can be used to grab and save items to an image file. The component provides 2 methods each with 2 overloads, grab and cropAndGrab.

grab is for grabbing and saving an item to a file asynchronously, while cropAndGrab does the same but allows cropping to a specific size when saving.

[outfoxxed]

In general I prefer asynchronous operations like this to be done via QML elements.

In this case something like

ItemImageGrab {
  function grab(item: Item, path: url, imageSize: size);
  function grab(item: Item, path: url); // calls prev with image size
  signal saved();
  signal failed();
}

Really this is better suited to promises, whenever those get done.

[soramanew]

Unfortunately, I have no idea how to make a custom qml object 😭

I'll try work on this in a few days I guess

[outfoxxed]

also format

[soramanew]

also format

Yeah sorry, forgot about that lol