Moved over the necessary classes to llappearance to support the loading of the
avatar's structure & params from file.

reviewed by davep.

Added more displacement range for butt leftright.

Changed _driven params to cross wearables; major fix so they wouldn't keep getting reset to default values from wearable.
Took out smoothing param.
Redefined maxeffect param to affect range of motion.

Added more logic to not center camera during edit physics mode.

Reduced extent of belly motion.

Did a bunch of code cleanup.

Renamed various parameters.

Turned off normal/binormal effects for morphing.
Fixed issue where updates were always being sent even if below the change threshold.

Added butt and belly.

16-byte aligned vertex buffers.
(almost) fully vectorized avatar vertex buffer updating --- index buffers still need to be vectorized

No expected functionality change; this mostly contains cosmetic cleanup.

Reviewed by: Nyx

merging in new wearable infrastructure to get a step closer to eventually supporting multiple wearables per type. Merge tested and compiles/working on linux and windows - no obvious regressions on appearance or appearance editor. Merge generated no conflicts due to being tested in fresh re-branch in avatar-pipeline/multiple-textures-12. Merge perfomed with following command:

svn merge -r 136489:136510 svn+ssh://svn.lindenlab.com/svn/linden/branches/avatar-pipeline/multiple-textures-12 .

Progress can be tracked in DEV-32551.

 -Nyx