Modernize std::sort with ranges and projections

In PPCTables.cpp, the code is currently unused so I was unable to test it.

In CustomPipeline.cpp, a pointer to member function cannot be used due to 16.4.5.2.1 of the C++ Standard regarding "addressable functions". https://eel.is/c++draft/namespace.std#6

In Fs.cpp and DirectoryBlob.cpp, these examples used projections in a previous iteration of this commit, but no longer do. Still, they remain in this commit because the PR they would actually belong to is already merged.

Source/Core/VideoCommon/GraphicsModSystem/Runtime/CustomPipeline.cpp

@@ -165,10 +165,8 @@ std::vector<std::string> GlobalConflicts(std::string_view source)
   // Sort the conflicts from largest to smallest string
   // this way we can ensure smaller strings that are a substring
   // of the larger string are able to be replaced appropriately
-  std::sort(global_result.begin(), global_result.end(),
-            [](const std::string& first, const std::string& second) {
-              return first.size() > second.size();
-            });
+  std::ranges::sort(global_result, std::ranges::greater{},
+                    [](const std::string& s) { return s.size(); });
   return global_result;
 }