Updated editor config

.editorconfig

@@ -42,10 +42,10 @@ csharp_indent_labels = one_less_than_current
 csharp_preferred_modifier_order = public,private,protected,internal,file,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async:suggestion
 
 # avoid this. unless absolutely necessary
-dotnet_style_qualification_for_field = false:suggestion
-dotnet_style_qualification_for_property = false:suggestion
-dotnet_style_qualification_for_method = false:suggestion
-dotnet_style_qualification_for_event = false:suggestion
+dotnet_style_qualification_for_field = false:error
+dotnet_style_qualification_for_property = false:error
+dotnet_style_qualification_for_method = false:error
+dotnet_style_qualification_for_event = false:error
 
 # Types: use keywords instead of BCL types, and permit var only when the type is clear
 csharp_style_var_for_built_in_types = false:suggestion
@@ -154,6 +154,10 @@ csharp_space_between_method_declaration_parameter_list_parentheses = false
 csharp_space_between_parentheses = false
 csharp_space_between_square_brackets = false
 
+# Custom
+csharp_style_namespace_declarations = file_scoped:error
+dotnet_diagnostic.IDE0005.severity = error # Using directive is unnecessary.
+
 # C++ Files
 [*.{cpp,h,in}]
 curly_bracket_next_line = true