Fix relwithdebug.
Only use LLAvatarJoint when necessary, else LLJoint
Clean up a few harmless compiler warnings (signed/unsigned, double to float)
Fixed some odd initialization oddness in develop.py. Also changed win64 build targetdir to build-vc###-Win64
Use a dynamic buffer for LLMeshHeaderResponder.
Use [SHORT_APP_NAME] xui/de/floater_about.xml as per liru request.