Update Available - Version 8.0.165

[jsachs]

An update is available to Version 8.0.165 (14-Oct-2020)

The changes (taken from the update log) are:

Light Falloff: greatly improved the accuracy of automatically computed correction curves from a sample image. Added options to darken center, lighten corners or both.

Mask: fixed problem of not taking control of the mouse cursor in some cases when switching mask tools.

This version is numbered 8.0.165 (the same as the last update) because I forgot to increment the version number, but it should have been 8.0.166.