moved all configuration files for m16ib20 arm into their own folder
changed all references to m16ib20 configuration files to point to the right subdirectory under the config folder
camera angle and tf display change
created directory and configuration files for abb irb2400 robot arm
xacro file for abb irb2400 and environment components
launch files for simulation of abb irb2400
added arm navigation package for irb2400 arm and mtconnect components