Added a way to check Block Size, Compression Method, and Compression Level flags to dolphin-tool

New dolphin-tool command: "header"
-b / --block_size
-c / --compression
-l / --compression_level

Informative RVZ/WIA header2 value "compression_level" is now a s32 instead of a u32, because negative compression is a thing.

Speaking of, it is now possible to use negative compression levels in dolphin-tool's convert command (not the GUI, though).

Source/Core/DiscIO/VolumeFileBlobReader.cpp

@@ -58,6 +58,11 @@ std::string VolumeFileBlobReader::GetCompressionMethod() const
   return m_volume.GetBlobReader().GetCompressionMethod();
 }
 
+std::optional<int> VolumeFileBlobReader::GetCompressionLevel() const
+{
+  return m_volume.GetBlobReader().GetCompressionLevel();
+}
+
 bool VolumeFileBlobReader::Read(u64 offset, u64 length, u8* out_ptr)
 {
   if (offset + length > m_file_info->GetSize())