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/DiscIO/VolumeVerifier.cpp

@@ -1053,8 +1053,7 @@ void VolumeVerifier::SetUpHashing()
     m_scrubber.SetupScrub(m_volume);
   }
 
-  std::sort(m_groups.begin(), m_groups.end(),
-            [](const GroupToVerify& a, const GroupToVerify& b) { return a.offset < b.offset; });
+  std::ranges::sort(m_groups, {}, &GroupToVerify::offset);
 
   if (m_hashes_to_calculate.crc32)
     m_crc32_context = Common::StartCRC32();