Add a clang-format-ignore and suppress/revert a few files that are not actually compatible/appropriate to auto-format

Author: dmachaj

.clang-format-ignore

@@ -0,0 +1,5 @@
+_build/*
+
+**/CxClass.*
+test/old_tests/Component/Component_h.h
+test/old_tests/Composable/Composable_h.h

test/nuget/TestRuntimeComponentCXReferencingWinRTStaticLibrary/CxClass.cpp

@@ -4,7 +4,7 @@
 using namespace TestRuntimeComponentCXLibrary;
 using namespace Platform;
 
-CxClass::CxClass(TestStaticLibrary7Class ^ c)
+CxClass::CxClass(TestStaticLibrary7Class^ c)
 {
     c->Test();
 }

test/nuget/TestRuntimeComponentCXReferencingWinRTStaticLibrary/CxClass.h

@@ -2,10 +2,9 @@
 
 namespace TestRuntimeComponentCXLibrary
 {
-public
-    ref class CxClass sealed
+    public ref class CxClass sealed
     {
     public:
-        CxClass(TestStaticLibrary7Class ^ c);
+        CxClass(TestStaticLibrary7Class^ c);
     };
-} // namespace TestRuntimeComponentCXLibrary
+}