Update to newer .net framework

[rasyidf]

TLDR:
This will deprecate windows XP minimum requirements.😢😢

Describe the solution you'd like
Upgrading this project will benefits many fixes and performance it bring with newer frameworks. the're atleast 3.8k lines of improvement that can be applied with newer Analyzers.

Describe alternatives you've considered
for a starting point, we can update to .net 4.8 and separate the program (especially UI and Core) step by step. then we could, change the WinForm to .net core / .net 6 later.

Additional context
Accesibility

[svenhb]

Then GRBL-Plotter is not compatible with windows XP anymore.

[svenhb]

Also I don't care most of the warnings. Some how you can configure the warnings, to get much less.

[rasyidf]

and? will there be any update for net framework 4.8?

[svenhb]

we'll see, maybe I'll start at the end of the year.

[smakhtin]

I started the PR here, to fix DPI autoscaling we need to update to .NET 4.8. Autoupdate seemd to work quite straightforward.

[svenhb]

As already written: Then GRBL-Plotter is not compatible with windows XP anymore.
Will check how to work with new branch...
Thanks so far....

[smakhtin]

@svenhb The PR title was about .net version update, so I linked PR here. In the app manifest, I marked support till Win7. Windows XP indeed is too old to support. No prob, glad to help, amazing software.