Improve vector and matrix performance and add swizzle support to .net build-int VectorX type.

Misaki.HighPerformance.LowLevel/Collections/FixedText.tt

@@ -1,9 +1,9 @@
-<#@ template debug="false" hostspecific="false" language="C#" #>
+<#@ template debug="false" hostspecific="false" language="C#" #>
 <#@ assembly name="System.Core" #>
 <#@ import namespace="System.Linq" #>
 <#@ import namespace="System.Text" #>
 <#@ import namespace="System.Collections.Generic" #>
-<#@ output extension=".cs" #>
+<#@ output extension=".gen.cs" #>
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Text;