Add larger image attachment sizes

[dananjohnson]

Currently the only uncropped attachment size larger than medium is original. medium is only 640px wide, and we're using it in places like resource slides at 1135px wide on desktop displays.

We have a large_landscape size, but we should also have a large option that's 1280px wide. We might also want to consider a large_2dpi at 2560px for retina devices.

[zdavis]

Thank you for taking the time to open this feature request. The Manifold team reviewed this issue during our bi-weekly meeting and the consensus is that this feature makes sense and is in keeping with our overall vision for the platform. Moreover, we see this request as a viable candidate for development under our current available funding. We’re adding an “accepted” label to this request to indicate that it’s within scope and possibly within budget.

The next step is for us to estimate the work involved with this and add it to our feature backlog. Our acceptance of the issue is not a promise that it will be implemented. We will balance this request against the other accepted requests and do our best to implement it within our current available funding.

This was an automated message, but please don't hesitate to reply. Our team watches these issues closely and will respond as soon as we're able to!