Shunt C# embed to its own test file

So we can be more permissive and hopefully keep older ST versions

Author: michaelblyons

Tests/syntax_test_Add-Type.ps1

@@ -0,0 +1,25 @@
+# SYNTAX TEST "Packages/PowerShell/PowerShell.sublime-syntax"
+
+
+    Add-Type -Language CSharp @"
+#   ^^^^^^^^ support.function.powershell
+#            ^^^^^^^^^ variable.parameter.option.powershell
+#            ^ punctuation.definition.parameter.powershell
+#                             ^^ meta.string.interpolated.powershell string.quoted.double.powershell punctuation.definition.string.begin.powershell
+    using System;
+#^^^^^^^^^^^^^^^^ meta.string.interpolated.powershell string.quoted.double.powershell source.cs.embedded
+#   ^^^^^ keyword.control.import.cs
+#         ^^^^^^ meta.path.cs
+#               ^ punctuation.terminator.statement.cs
+    using System.Runtime.InteropServices;
+    public class ClassGetForegroundWindow {
+#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.string.interpolated.powershell string.quoted.double.powershell source.cs.embedded
+#   ^^^^^^ storage.modifier.access.cs
+#          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.class.cs
+#          ^^^^^ keyword.declaration.class.cs
+#                ^^^^^^^^^^^^^^^^^^^^^^^^ entity.name.class.cs
+#                                         ^ meta.class.body.cs meta.block.cs punctuation.section.block.begin.cs
+        [DllImport("user32.dll")]
+        public static extern IntPtr GetForegroundWindow();
+    }
+"@

Tests/syntax_test_PowerShell.ps1

@@ -1744,30 +1744,3 @@ function get-number {}
 #^^^^^^^^^ keyword.other.region.end.powershell
 #<- comment.line
 #                         ^ meta.fold.end
-
-    Add-Type -Language CSharp @"
-#   ^^^^^^^^ support.function.powershell
-#            ^^^^^^^^^ variable.parameter.option.powershell
-#            ^ punctuation.definition.parameter.powershell
-#                             ^^ meta.string.interpolated.powershell string.quoted.double.powershell punctuation.definition.string.begin.powershell
-    using System;
-#^^^^^^^^^^^^^^^^ meta.string.interpolated.powershell string.quoted.double.powershell source.cs.embedded
-#   ^^^^^ keyword.control.import.cs
-#         ^^^^^^ meta.path.cs
-#               ^ punctuation.terminator.statement.cs
-    using System.Runtime.InteropServices;
-    public class ClassGetForegroundWindow {
-#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.string.interpolated.powershell string.quoted.double.powershell source.cs.embedded
-#   ^^^^^^ storage.modifier.access.cs
-#          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.class.cs
-#          ^^^^^ keyword.declaration.class.cs
-#                ^^^^^^^^^^^^^^^^^^^^^^^^ entity.name.class.cs
-#                @@@@@@@@@@@@@@@@@@@@@@@@ global-definition
-#                @@@@@@@@@@@@@@@@@@@@@@@@ local-definition
-#                                         ^ meta.class.body.cs meta.block.cs punctuation.section.block.begin.cs
-        [DllImport("user32.dll")]
-        public static extern IntPtr GetForegroundWindow();
-#                                   @@@@@@@@@@@@@@@@@@@ global-definition
-#                                   @@@@@@@@@@@@@@@@@@@ local-definition "  GetForegroundWindow"
-    }
-"@