[Feature Request] Custom Resolution Scaling (or non-integer resolution scaling)

[Chalking]

Thank you so much for this awesome emulator.

I'd like to request, if possible, that the internal resolution of melonDS could be changes to support custom resolutions, or at least custom scales that aren't integers? So instead of just 1x or 2, the user could potentially use 1.5x or 1.23675x or anything they choose.

I'm speaking with a developer of Melon Mix, a Kindgom Hearts project that uses melonDS as a basis to unify the dual screens of the DS into one, and give widescreen support. But without the option to scale the game using an integer scale of around 1.33, in widescreen(single-screen mode), the HUD elements get distorted, and unreadable at native resolution.

Thank you so much for reading and thank you again for creating this!!