Disable preview single instance

[UserCarl]

Turn off showing preview with a single window open. This way I won't have to keep closing the program when using only 1 client.

[feyyd]

Hide preview of active Eve client and Hide previews when EVE client is not active seems to achieve the behaviour desired if I am not mistaken. Is there something I am missing?

EDIT - I'm realizing that the issue is just not wanting to check the option every time if your multi-client setup has it enabled. So this is just a QOL/Convenience thing I think.

[feyyd]

Hey there, I don't have VS 2019 installed atm, but was working on Eve-O stuff last night and implemented this feature. If you want to implement it on your client you can make the change in your build using this commit:
c3782bb

If you aren't familiar with git you'll have to wait until someone makes these changes in 2019 targeting .NET 4.5. I will probably install 2019 and do some pull requests as I've added a few features now that have been requested, but I have no timeline for that.

[feyyd]

Created a pull request for this feature, ended up getting VS 2019 and adding the option to the UI. Can find it here if you don't want to wait until it gets merged into master/beta.

#18