linux support

[rep467]

Is there any reason why linux is not supported ? I was able to compile it on fedora without any issues after removing linux from the BlacklistPlatforms list in ColorWheelPlugin.uplugin.

Also thanks a lot for this plugin.

[W2Wizard]

It wasn't tested on linux ever so I couldn't verify if there were any bugs or if it even compiled.

If it works however Ill remove it and update the version.