BART: use bart.Lite for ACLs

[gaissmai]

• If you are only using BART for white/blacklisting, you should use bart.Lite. It offers the same speed as bart.Table while consuming less memory.

• If you want to determine the number of ACL entries, use the Size() method instead of iterating over All().

[dombyte]

Thanks for the Information! It was one of my first Go Projects. Because of that the project will become deprecated in favour of a new one which will Implement your recommendations.