Decode a LEB128-encoded value of signed integer type SInt.
Decode a ULEB128 value.
Encode a LEB128-encoded value of signed integer type SInt to os.
Encode a ULEB128 value to os.
Encode a ULEB128 value to a buffer.
https://en.wikipedia.org/wiki/LEB128
http://forum.dlang.org/post/ykskvwqdsxlyjispappj@forum.dlang.org
TODO: Move to Phobos at std/experimental/codings/leb128.d
LEB128 (Little Endian Base 128).