Change getattr and statx to bespoke policies

* Provides: slight improvement in performance as it no longer will
need to find and then act on the files.
* It doesn't make sense to support all original policy types. Most
people used 'newest' or 'ff' and 'combine' is a better default which
has same runtime as 'newest' but with better output.

src/func_getattr_factory.cpp

@@ -0,0 +1,44 @@
+#include "func_getattr_factory.hpp"
+
+#include "func_getattr_cdfo.hpp"
+#include "func_getattr_cdco.hpp"
+#include "func_getattr_ff.hpp"
+#include "func_getattr_newest.hpp"
+
+#include "policies.hpp"
+
+bool
+Func2::GetAttrFactory::valid(const std::string str_)
+{
+  if(str_ == "cdfo")
+    return true;
+  if(str_ == "cdco")
+    return true;
+  if(str_ == "ff")
+    return true;
+  if(str_ == "newest")
+    return true;
+
+  if(Policies::Search::find(str_))
+    return true;
+
+  return false;
+}
+
+std::shared_ptr<Func2::GetAttrBase>
+Func2::GetAttrFactory::make(const std::string_view str_)
+{
+  if(str_ == "cdfo")
+    return std::make_shared<Func2::GetAttrCDFO>();
+  if(str_ == "cdco")
+    return std::make_shared<Func2::GetAttrCDCO>();
+  if(str_ == "ff")
+    return std::make_shared<Func2::GetAttrFF>();
+  if(str_ == "newest")
+    return std::make_shared<Func2::GetAttrNewest>();
+
+  if(Policies::Search::find(str_))
+    return std::make_shared<Func2::GetAttrCDFO>();
+
+  return {};
+}