.NET 5.0/6.0 upgrade

[PiKeyAr]

I've tried to upgrade the tools to .NET 6.0 on this branch. Here's a test build.

Advantages of the upgrade:

• Better performance, especially with 3D editors.
• Possibility to implement things such as the folder browser dialog natively without hacks or third party packages.
• WinForms improvements, easier to implement High DPI support, easier to design the UI at/for High DPI.
• Futureproof: .NET Framework is no longer in development, and .NET 5.0 onwards is .NET Core based. Framework to Core/.NET 5.0 is a huge jump, but updates after that should be much easier. 5.0 to 6.0 was very easy to switch.

Issues with the upgrade:

• 32-bit support: Unlike Framework, it is not possible to build EXE files that work in both 32-bit and 64-bit modes. We will have to either drop 32-bit support or provide a separate package of 32-bit tools.
• Visual Studio requirement: If we go for 6.0, SA Tools will only be possible to build with Visual Studio 2022. This brings a bunch of problems because 2022 can't build for .NET Framework 4.0-4.5, so it can't build the Mod Loader. We'll either have to upgrade the Mod Loader to 4.8 or downgrade the tools to .NET 5.0, which can be built with VS2019.
• Bad folder layout: There is no native way to neatly organize EXE and DLL files in separate folders, so the current setup with the DLLs in the "lib" folder will have to go, and all tools will have to be either dumped into one folder or built as single EXE files. Kinda fixed with AppHostPatcher.

I'd like to hear everyone's opinions on whether we should proceed with the upgrade or not, and what setup to choose if we do.

[PiKeyAr]

I was experimenting with AppHostPatcher and it ended up being the most optimal solution in combination with a custom build arrange program that I wrote. The layout is pretty good now, even a bit better than the current version. Here's a test build. This is 5.0 based because of Visual Studio concerns. Switching to 6.0 will be very easy. https://dcmods.unreliable.network/owncloud/data/PiKeyAr/files/Various/sa_tools_net50.7z

[PiKeyAr]

On 5.0 now!