v1.4.13-rc53

• JSON Change: Undocumented node flow_bitmap_bgra_ptr { ptr_to_flow_bitmap_bgra_ptr: *} is now flow_bitmap_key_ptr { ptr_to_bitmap_key: * }
• Fixes #553
• JSON endpoints v1/get_image_info and v1/get_scaled_image_info now return dimensions that reflect exif orientation data.
• All memory allocations now occur in Rust instead of C.
• More C code ported to Rust.