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/CompressedBlob.h

@@ -58,6 +58,7 @@ public:
   u64 GetBlockSize() const override { return m_header.block_size; }
   bool HasFastRandomAccessInBlock() const override { return false; }
   std::string GetCompressionMethod() const override { return "Deflate"; }
+  std::optional<int> GetCompressionLevel() const override { return std::nullopt; }
 
   u64 GetBlockCompressedSize(u64 block_num) const;
   bool GetBlock(u64 block_num, u8* out_ptr) override;