Migrated the license to MIT

[Lakritzator]

Also removed .NET 5.0 support as this is EOL.

Closes #56

[Lakritzator]

Created this for #56

[Lakritzator]

I also bumped up the version to 2.0.x as I consider a license change a potential breaking / major change.
Look at this to see how the file header was changed: https://github.com/hardcodet/wpf-notifyicon/pull/84/files#diff-ffd2fa4db00e15fe03e88dff6cc543d6be7000eeb99c57000dbfbdd44e90d889

[Lakritzator]

Oh, forgot, I also changed the namespace to use file scoped namespace. I probably regret that change, not for the change itself but as some PR will no longer merge without manual work. 🙄

I already regretted it, so I undid the change.

[trungnt2910]

It's been a while, what's the status of this PR?
I also see that this branch has conflicts with the base.

[Lakritzator]

Life came in between, just wait.

[Lakritzator]

Hey @punker76 & @hardcodet can you take a look at this, so we can merge it?

[tstavropoulos]

Hey @Lakritzator and @hardcodet

I saw the discussion about this in #56. This is a really great project, and pulling in this license change would definitely make my life easier. Any chance of that happening? Thanks, and good luck!

[hardcodet]

This seems to have been copy/pasted from Dapplo ;)

[Lakritzator]

Damn, I was hoping you would oversee it, so I have all rights... no just kidding.
Let me correct that...

[Linx-ESP]

Any news?

[kjean667]

I'm a bit interested in this license change as well due CPOL not being on a corporate's acceptable use list. Are there any stoppers from this being merged? @hardcodet @punker76

[punker76]

@Lakritzator @hardcodet LGTM

[jeroenwalter]

Hi, any chance that this PR can be added to the main base instead of waiting on a 2.0.0 milestone, that has no clear ETA?
I found this fork, https://github.com/HavenDV/H.NotifyIcon , that changed the license to MIT, but I don't think one can just change the license without the express permission of the current maintainers.