Add CustomAspectRatio as Selectable Option

[anonymouz4]

No description provided.

[TimOliver]

Thanks for the PR! But why is this necessary exactly? What sort of use-case are you thinking about?

[anonymouz4]

Well I build a extensive Snapchat Tweak and one certain Aspect Ratio is used by the image Viewer.
So if the image isn't in the certain aspect ratio, some parts are cut away, so I used a custom ratio.

Problem was that if someone moved the grid, he wouldn't be able to return to the custom Aspect Ratio I set. So I added a Selectable Option

And the custom Name is just so he knows that that aspect ratio is the intended one for the app.

[TimOliver]

Hmm. Okay! I see what you mean.

Admittedly, I was always wanting to keep the concept of custom aspect ratios internal. I'll approve it now, but I'll modify it so that "Custom" isn't visible unless it is non-nil, otherwise this changes the base behaviour of the library quite a lot.

In future, I think I need to revisit the whole way aspect ratios are handled in this app. It's pretty obvious an enum isn't flexible for a lot of use cases here.

Thanks for the PR!