Open images and media in a separate window to avoid being constrained to the main window size

[sveggiani]

Describe

When the user clicks an image or a video to see it in detail, it's displayed contained and restricted to the size of the main Window. It should be displayed in a separate, resizable window to allow seeing it with more detail.

Why

When using the app in certain proportions (like in a tall, timeline view) the media is displayed really small. See the following attachment for an example.