Prepare for .NET 8 #150

.editorconfig

@@ -21,12 +21,15 @@ indent_size = 2
 [*.cs]
 
 # Code style defaults
-csharp_using_directive_placement = outside_namespace:suggestion
+csharp_using_directive_placement = outside_namespace:error
+csharp_style_implicit_object_creation_when_type_is_apparent = true:suggestion
 dotnet_sort_system_directives_first = true
 dotnet_style_readonly_field = true:suggestion
+csharp_style_namespace_declarations = file_scoped:error
 
 # License header
 file_header_template = Copyright (c) Microsoft Corporation.\nLicensed under the MIT License.
+dotnet_diagnostic.IDE0073.severity = error
 
 # Suggest more modern language features when available
 dotnet_style_object_initializer = true:suggestion
@@ -42,9 +45,17 @@ dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
 dotnet_style_prefer_conditional_expression_over_return = true:suggestion
 csharp_prefer_simple_default_expression = true:suggestion
 
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_prefer_not_pattern = true:suggestion
+csharp_style_prefer_switch_expression = false:none
+csharp_style_prefer_pattern_matching = false:none
+
 # Prefer "var" everywhere
 csharp_style_var_for_built_in_types = true:suggestion
 csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
 csharp_style_var_elsewhere = true:suggestion
 
 # Define the 'private_fields' symbol group: