Update changes.txt

Update version string to 1.62.3.

Update version to 1.62.2.

Update version strings from 1.62 to 1.62.1.

Update appveyor.yml

Merge pull request #738 from ds22x/master

[Libretro] Create a separate aspect ratio option for "4:3 Preserved"

Update changes.txt, appveyor.yml.

Update version to 1.59.2.

Bump version number to 1.59.1.

GTK: Use actual NTSC frame time.