StringUtil: Move IsPrintableCharacter() into Common namespace

Source/Core/Core/Core.cpp

@@ -193,7 +193,7 @@ void DisplayMessage(std::string message, int time_in_ms)
     return;
 
   // Actually displaying non-ASCII could cause things to go pear-shaped
-  if (!std::all_of(message.begin(), message.end(), IsPrintableCharacter))
+  if (!std::all_of(message.begin(), message.end(), Common::IsPrintableCharacter))
     return;
 
   OSD::AddMessage(std::move(message), time_in_ms);

Source/Core/Core/IOS/ES/Formats.cpp

@@ -302,7 +302,7 @@ std::string TMDReader::GetGameID() const
   std::memcpy(game_id, m_bytes.data() + offsetof(TMDHeader, title_id) + 4, 4);
   std::memcpy(game_id + 4, m_bytes.data() + offsetof(TMDHeader, group_id), 2);
 
-  if (std::all_of(std::begin(game_id), std::end(game_id), IsPrintableCharacter))
+  if (std::all_of(std::begin(game_id), std::end(game_id), Common::IsPrintableCharacter))
     return std::string(game_id, sizeof(game_id));
 
   return fmt::format("{:016x}", GetTitleId());
@@ -313,7 +313,7 @@ std::string TMDReader::GetGameTDBID() const
   const u8* begin = m_bytes.data() + offsetof(TMDHeader, title_id) + 4;
   const u8* end = begin + 4;
 
-  if (std::all_of(begin, end, IsPrintableCharacter))
+  if (std::all_of(begin, end, Common::IsPrintableCharacter))
     return std::string(begin, end);
 
   return fmt::format("{:016x}", GetTitleId());

Source/Core/Core/IOS/FS/HostBackend/FS.cpp

@@ -474,8 +474,11 @@ ResultCode HostFileSystem::Format(Uid uid)
 ResultCode HostFileSystem::CreateFileOrDirectory(Uid uid, Gid gid, const std::string& path,
                                                  FileAttribute attr, Modes modes, bool is_file)
 {
-  if (!IsValidNonRootPath(path) || !std::all_of(path.begin(), path.end(), IsPrintableCharacter))
+  if (!IsValidNonRootPath(path) ||
+      !std::all_of(path.begin(), path.end(), Common::IsPrintableCharacter))
+  {
     return ResultCode::Invalid;
+  }
 
   if (!is_file && std::count(path.begin(), path.end(), '/') > int(MaxPathDepth))
     return ResultCode::TooManyPathComponents;

Source/Core/Core/IOS/USB/USBV4.cpp

@@ -87,7 +87,7 @@ void V4GetUSStringMessage::OnTransferComplete(s32 return_value) const
   auto& memory = system.GetMemory();
 
   std::string message = memory.GetString(data_address);
-  std::replace_if(message.begin(), message.end(), std::not_fn(IsPrintableCharacter), '?');
+  std::replace_if(message.begin(), message.end(), std::not_fn(Common::IsPrintableCharacter), '?');
   memory.CopyToEmu(data_address, message.c_str(), message.size());
   TransferCommand::OnTransferComplete(return_value);
 }