Added the attributes flags to the GPT partitions. For example:
- 0x0000000000000000 (GPT_BASIC_DATA_ATTRIBUTE)
- 0x0000000000000001 (GPT_ATTRIBUTE_PLATFORM_REQUIRED)
- 0x8000000000000000 (GPT_BASIC_DATA_ATTRIBUTE_NO_DRIVE_LETTER)
- 0x4000000000000000 (GPT_BASIC_DATA_ATTRIBUTE_HIDDEN)
- 0x2000000000000000 (GPT_BASIC_DATA_ATTRIBUTE_SHADOW_COPY)
- 0x1000000000000000 (GPT_BASIC_DATA_ATTRIBUTE_READ_ONLY)