SL-427 - trying less frequent computeBodySize() updates to avoid 'camera at sea' and related issues.

MAINT-6647 - make SLM behavior still available if MeshImportUseSLM is true; still defaults to false.

MAINT-6647 - ignore previously created slm files on model upload. SL-442 - change coloring for show bones, to highlight joint positions and rigging

The CMake invocations are controlled by UNATTENDED -- these were not. Let
CMake do it if it must be done.

VSTool manipulates the SecondLife.sln solution file for the convenience of a
developer subsequently running Visual Studio interactively. But the cost of
having it sometimes break TeamCity automated builds is too high -- especially
since we never expect to run Visual Studio interactively on a TC build host.

Also remove the CMake UNATTENDED variable that controlled it.

MAINT-6631 - reluctantly, added support for animation of collision volumes, to avoid breaking existing content.

SL-109 - made viewer much less tolerant of bad data in avatar_skeleton.xml or avatar_lad.xml. If either of these is broken, there's no point trying to continue, more informative to just error out with an appropriate message.

SL-433 - fix for mesh eye scaling with eye size slider. Previous values were based on incorrectly sized reference eyes.

The only call to the findDiscardLevelsBoundaries() method was commented out
inside initDecode(), with a comment:
        // Merov : Test!! DO NOT COMMIT!!

This was the only caller of copy_tile(), which was the only caller of
copy_block(). Commented out all three of these (biggish!) functions, since I
have no idea what any of them were supposed to do or when it might be useful
to call them. In other words, I can't yet rule out the possibility that I
might have to uncomment them.

Use boost::scoped_ptr instead of raw pointers to LLKDUMemSource,
LLKDUDecodeState, kdu_coords and kdu_dims so cleanup is simpler, and automated
on destruction of LLImageJ2CKDU.

Replace pointer to kdu_codestream with a custom RAII class. kdu_codestream is
itself an opaque handle, so we don't need to add another layer of indirection.
Just wrap it to ensure its destroy() method is reliably called when needed.

Make static instances of LLKDUMessageWarning and LLKDUMessageError
self-register, eliminating the companion static bool and explicit checks in
code.

instead of legacy BOOL.

Derive them both from a common base class that does the message logging,
instead of having each handler class log redundantly -- especially since the
put_text() override accepting const kdu_uint16* was simply streaming the
kdu_uint16 pointer to the log file, which would log the hex value of the
pointer.

Although we want a static instance of each of these handler classes, pull it
out rather than nesting the instance within the class itself.