Compat with dotnet5 and PDN 4.3

[toehead2001]

No description provided.

[toehead2001]

This gets ScriptLab running in Paint.net v4.3

The plugin still has some hacky stuff that Rick probably doesn't like, but this will give you a headstart to any further changes you want to make.

[rickbrew]

Yeah this plugin will, at the very least, need to not do the AppDomain.CurrentDomain.AssemblyResolve hooking. That really breaks things and is a really bad idea in general. And I don't think the code is necessary anymore (I assume it was working around something); it's in FileMan.cs LoadFileXML and SaveFileXML

[rickbrew]

The extension method, TryUseTileOrToSurface() is being marked internal in the next 4.3 build, so you'll need your own copy of that as well (can also just replace it with a call to ToSurface())

[rickbrew]

This PR would also need to use IEffectsService2 (new in v5.0, remember) instead of doing its own directory scanning, assembly loading, and instance creation. Otherwise it's not eligible to be published on the forum again.