Make "Advanced unit selection" dialog movable

[Koffy25]

Closes #1111

[lmoureaux]

Will test later tonight/tomorrow, for now I noticed that the commit message looks strange, maybe you want to change it?

[Koffy25]

Will test later tonight/tomorrow, for now I noticed that the commit message looks strange, maybe you want to change it?

Done.

[Koffy25]

I got an email that says the windows clang step failed but it says passed in the pull request so I'll assume all is well.

[lmoureaux]

I got an email that says the windows clang step failed but it says passed in the pull request so I'll assume all is well.

Indeed, I saw it too. Probably an earlier version of the commit, the Windows clang build isn't 100% reliable because of frequent network errors when pulling dependencies.

[jwrober]

I don't think its appropriate for me to speak to code quality, however I did test this PR in my local and it does as advertised. The dialog is no longer modal and does allow me to move it around. It may also be a model for us to get rid of the hacked dialogs.

[lmoureaux]

Since it was confirmed that this works, my only question is why disband_box was also moved?

[Koffy25]

Since it was confirmed that this works, my only question is why disband_box was also moved?

At one time it was getting the "unexpected class name" error but the recursive include issue is fixed now so I'll move it back

[lmoureaux]

Thanks!