Global System using directives should be sorted first

[vipentti]

First of all, great project and big fan of automating formatting.

I noticed an inconsistency when it comes to sorting regular using System* directives vs global using System* directives:

When sorting the regular using directives the System using directives are ordered before the non-system using directives.

However when sorting global using all the directives are grouped together and sorted as one set.

Basically sorting the following:

using Library;
using System;
using AnotherLibrary;

Results in

using System;
using AnotherLibrary;
using Library;

Where as sorting the following:

global using Library;
global using System;
global using AnotherLibrary;

Results in

global using AnotherLibrary;
global using Library;
global using System;

My suggestion would be to use the same pattern with global System using directives so that they would be sorted before other non-System global using directives.

I don't mind doing the work if this sounds like a reasonable idea.

csharpier/Src/CSharpier/SyntaxPrinter/UsingDirectives.cs

Lines 217 to 223 in a877f7d

	yield return globalUsings.OrderBy(o => o.Using, Comparer).ToList();
	yield return globalAliasUsings.OrderBy(o => o.Using, Comparer).ToList();
	yield return systemUsings.OrderBy(o => o.Using, Comparer).ToList();
	yield return aliasNameUsings.OrderBy(o => o.Using, Comparer).ToList();
	yield return regularUsings.OrderBy(o => o.Using, Comparer).ToList();
	yield return staticUsings.OrderBy(o => o.Using, Comparer).ToList();
	yield return aliasUsings.OrderBy(o => o.Using, Comparer).ToList();

[JamieJamesJamie]

This issue also highlights a conflict between CSharpier and StyleCop Analyzers SA1208. The inconsistency mentioned is picked up by that rule.

[will-molloy]

Yeah this is inconsistent with dotnet format style so it conflicts with dotnet format (according to this page https://csharpier.com/docs/IntegratingWithLinters)