Cleanup C# projects, code quality & style

New rules:
- Do not silence CA1805 any more
- Limit where we silence CA1707, CA1711, CA1720
- Enforce severity=warning for IDE0040
- Enforce Allman style braces
- Enforce naming conventions (IDE1006 is still severity=suggestion)

Fixes:
- Fix REFL045, CS1572, CS1573
- Suppress CS0618 when generating `InvokeGodotClassMethod`
- Fix indent when generating GD_constants.cs
- Temporarily silence CS1734 in generated code
- Fix a lot of naming rule violations

Misc.:
- Remove ReSharper comments for RedundantNameQualifier
- Remove suppression attributes for RedundantNameQualifier
- Remove severity=warnings for CA1716, CA1304 (already included in the level of analysis we run)

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/GlobalClassAnalyzer.cs

@@ -1,9 +1,7 @@
 using System.Collections.Immutable;
 using System.Linq;
-
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;
 
 namespace Godot.SourceGenerators
@@ -23,10 +21,8 @@ namespace Godot.SourceGenerators
             context.RegisterSyntaxNodeAction(AnalyzeNode, SyntaxKind.ClassDeclaration);
         }
 
-        private void AnalyzeNode(SyntaxNodeAnalysisContext context)
+        private static void AnalyzeNode(SyntaxNodeAnalysisContext context)
         {
-            var typeClassDecl = (ClassDeclarationSyntax)context.Node;
-
             // Return if not a type symbol or the type is not a global class.
             if (context.ContainingSymbol is not INamedTypeSymbol typeSymbol ||
                 !typeSymbol.GetAttributes().Any(a => a.AttributeClass?.IsGodotGlobalClassAttribute() ?? false))