add per project option to set a custom screenshots path

[DamnWidget]

Hi @SolarLune

This PR adds a per-project option to setup a custom screenshot output directory (if set). It also includes a fallback so in case that the directory does not exists it uses the application path directory as usual.

Regards

[SolarLune]

Hello! Thanks for the PR submission - this is an interesting feature.

The ProgramSettings variable is for global program settings, not for per-project settings. That should be stored in with the rest of the project information when saving the project (in Project.Save()).

I'm also not sure about the use of a ValidatePath() function that only is used once in the codebase - that could be done in the place where you're using it.

[DamnWidget]

I am not sure why but in my mind programSettings made a really good "per project" settings, will fix it as soon as I have a gap, will also inline the validation.

[DamnWidget]

Moved the setting to the project configuration and added a line to persist it on the project .plan file, also inlined the validation into main.go and removed the Validation function from common.go

Let me know if you want any more changes

[SolarLune]

OK, this looks good now. Thanks for the assistance!