fix(#71): remove unused wrong flag parsing logic

[ihzgniqgnem]

This PR removes the incorrect flag parsing logic in Blb3File.ReadBlocksInfoAndDirectory to fix #71:

• Flags should be inherent properties of nodes, not determined by their index in the array
• The flags field is currently unused in the codebase, so this change doesn't affect existing functionality

This is my first time writing a PR, so please forgive me if there are any inappropriate parts.

[Escartem]

Will test in the next days if this doesn't cause any unwanted side effects and then will merge

[Escartem]

I have slightly modified the code again to keep the flag reading but without the issue you pinpointed, this should work now, feel free to comment again if you think it is still wrong, otherwise I'll commit within a few days

[Escartem]

@all-contributors add @ihzgniqgnem for bug and code

[allcontributors]

@Escartem

I've put up a pull request to add @ihzgniqgnem! 🎉