Update readme.md - archival notice

Fixed formatting in the readme

Update download links in readme, add more info

Improve integer scaling with AR correction (fixes text mode on 1440p)

Fix screen tearing in fullscreen on Windows 10

Update Windows SDK version in projects

Fix download link in readme

Update readme

Update readme and version number

Fix high-DPI display modes

Rewrite pixel perfect scaling; properly support obscure resolutions

Fix compilation issues with MinGW

Add better config defaults

Fix scaling issues on odd pixel-doubled resolutions

Improve the fullscreen mode - use SDL window centering, don't exit fullscreen on lost focus