fix: Screenshot quality

[bitsandfoxes]

Currently, the screenshot quality was relative to the current screen size which creates issues when a project supports a wide range of different resolutions, making "half the current resolution" on small screens barely usable.

Instead, we can map High, Medium, Low to "ranges" of resolutions akin to what Youtube videos offer.

ScreenshotQuality.Full => // Don't touch
ScreenshotQuality.High => 1920,     // 1080p
ScreenshotQuality.Medium => 1280,   // 720p
ScreenshotQuality.Low => 854,       // 480p

We take the wider side (portrait or landscape) and scale the screenshot to match while preserving the aspect ratio. (defacto @vaind's original implementation) with an user-facing enum instead of a vec2 max resolution.

[vaind]

Glad to see this :)