Fixed some UI issues

Fixed some UI issues that entered from macOS mojave / dark mode

Fixed grainy images on resize

v1.3.1

Fixed grainy images on resize, v1.3.1

Added @1x scaling for pixel art

Can now upscale @1x images (have to have @1x in the filename) to @2x and @3x and fixes #8

Uses the nearest neighbour algorithm.

Improved update system

Improved the UpdateModel to now check for updates via the GitHub Api, uses the GitHub release assets for downloading the new version.

Code refactor + JPEG image quality fix

Refactored the code, much better now. Also fixed an issue where if the JPEG image quality was not 10/10 it would be really bad.

Fixed image size with 10/10 quality jpeg

v1.1.0

Fixed issue #5

Fixed the resizeing for non 72dpi images

v1.0.10

Updated to v1.0.10 - Fixed the resizeing for non 72dpi images

Fixed 3x resizing issue on Retina Macs

Fixed the issue where a 3x file was not correctly resized to 1x on Retina Macs.