Mesen 2.0.0-preview1

Edit: This build is very out of date at this point - it's better to use the latest dev build which includes a large number of bugfixes.

First preview - likely to have some bugs and save states/movies/settings/etc. might be incompatible with subsequent releases.

Requires installing the .NET 6 runtime on both Windows & Linux. (.NET 7 will not work)
On Linux, SDL2 is also required.