merge...

merge https://svn.aws.productengine.com/secondlife/export-from-ll/viewer-2-0@1211 https://svn.aws.productengine.com/secondlife/pe/stable-1@1228 -> viewer-2.0.0-3
QA:
New movement and camera controls. Test all movement and camera behavior against spec and expected behaviors, including sitting & standing.
Many other changes to the bottom bar.
Changes to local chat behavior.