Patch: Add JvAllocBytes() and RawDataManaged to CNI

[Bryce McKinlay]

This patch adds a new RawDataManaged type to CNI. This is used like 
RawData except the pointer will be marked by the garbage collector, so 
memory allocated by GC functions such as JvAllocBytes() can be stored in 
RawDataManaged fields and may be automatically freed when the object 
itself becomes unreachable. This gives us a way to explicity specify 
native data fields rather than using "Object", which is ugly and 
potentially unsafe.

The patch also officially adds JvAllocBytes() to the CNI interface and 
documents it.

I'm checking this in to mainline.

Regards

Bryce


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