This is something the format supports, but none of the builders
were doing. Can save 10-20% on FlatBuffer binary size!
Also fixed the Go tests.
Change-Id: I616c56ce9bbcfcaee23aa24f0532fcb60b6a8c75
Tested: on Linux.
The ByteBufferFactory interface gives the user an option to specify
the method in which the internal ByteBuffer is allocated. This provides
flexibility in the type of ByteBuffer that can be used.
The sizedInputStream method is an alternative to sizedByteArray that
does not make a copy of the data in memory.
Wouter van Oortmerssen