Binary read support for Ion 1.1 scalars

[zslayton]

Support parsing the new encodings for:

• Nulls - Add 1.1 binary reader support for typed nulls #766
• Bools - Add 1.1 binary reader support for bools #753
• Ints - Add 1.1 binary reader support for strings and integers. #754
• Floats - Add 1.1 binary reader support for floats #756
• Decimals - Add 1.1 binary reader support for decimals #757
• Timestamps - Add 1.1 binary reader support for timestamps. #765
• Strings - Add 1.1 binary reader support for strings and integers. #754
• Symbols - Add 1.1 binary reader support for symbols #758
• Blobs - Add 1.1 binary reader support for blobs and clobs #755
• Clobs - Add 1.1 binary reader support for blobs and clobs #755

[nirosys]

Base reader PR: #737