* Revert "Guess image mime type from file extension (fixes#5196) (#5212)"
This reverts commit 63ea99d38a.
* Use magic numbers to determine file type.
* fmt
* Don't wrap response in an option
* Regen Cargo.lock
* Clean-up + guess mime type from extension if server is unresponsive
* Move some things about.
* Some cleanup.
* Removing comment lines.
---------
Co-authored-by: Dessalines <tyhou13@gmx.com>