Migrate Builds to be Dotnet Core Compatible

[Mythra]

fixes #1

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• In order to start getting this project ready for Cross-OS building we need to be building with dotnet core. After this pr you should be able to on a windows machine run dotnet build from within the project directory to actually build the project using the dotnet core system (which will be required for cross-os compatibility).

  • I just chose the latest dotnet core version, since we weren't on dotnet core before, I figured there would be no problem upgrading to the latest dotnetcore with the longest support timeline. If we need to lower this for any reason, just let me know, and i can ratchet it down.
  • The build location has moved from: .\AC_e-Reader_Card_Creator\bin\Debug to .\AC_e-Reader_Card_Creator\bin\Debug\net8.0-windows. You may need to manually clean this directory if you've done a build before.

• Move signing out of being required for debug/release build, and behind a flag -p:SignAssemblies=True, now users can build debug/release binaries to their hearts content.

  • Users who want to test signing without the official key can generate a new key with sn -k AC_e-Reader_Card_Creator_TemporaryKey.snk then passing -p:SignAssemblies=True to their build arguments.

• Change from signing with pfx to snk as is required for dotnet core.

  • This means anyone with an existing pfx key will need to port to a snk, there's lots of tools for this online, I'm going to assume folks now how to do this, if not, let me know and I can share a workflow.
  • If we want we could switch to delay signing, and use things like signtool/etc. we could, but figured it's best to not do this in this PR.

• Also removed your home directory from the project, since we don't have your home directory structure 😉 -- you can still pass it in manually if the newer default doesn't work for you.

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Visual Studio builds should still continue to work as normal. I planned on documenting the build process in this PR, but there may be future changes coming as a result of doing cross-os support, so since there weren't any building instructions already, I figured we can just leave it undocumented for now, and document it at the end when we're sure it's stable.

[Mythra]

I wanted to migrate the build tooling before porting in the native executables, as we may want to add dependencies/have multiple libraries + binaries built which would required build changes. And didn't want to deal with the old build tooling, or have more work to do to migrate it to dotnet core later on 😄