Opaque TQ3Object

[Dair G. <da...@re...>]

Hi,

I've been through and checked in the last set of changes to make
TQ3Object opaque, which will allow us to rearrange its implementation
for some performance gains.

This is now on by default, and fingers crossed everything should still
work. However I haven't built the Windows/Unix builds so if they fail
for anyone let me know.

The QUESA_OBJECTS_ARE_OPAQUE define is still present, although it should
now be a no-op as nothing references the internal TQ3Object structure
(and so will be dropped shortly).

If anyone notices a problem, please let me know.


-dair
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