Changes with regards to issue #3

Packages were not building in install mode - fixed this.
See issue #3 for more details.

Added new features and redesigned GUI

New Features / Changes:

• Added option to wait for a specified duration after reaching a marker
• Added table showing transition and wait durations of all markers
• Added display showing the current velocity of the camera
• Added check box to hide the interactive marker controls to prevent unintentional pose changes
• Changed behaviour of "Move to current pose"-button:
  • previously using the transition time specified within the marker
  • now approaching marker in half a second, as this button is mostly used when creating trajectories
• Minor restructuring of GUI elements to see the most useful options at one glance

Changes with regards to issue #2

replaced search for parameters in global space by assigning plugin a global name and searching for parameters in this namespace

Minor changes due to user experiences

Starting video recorder in exemplary launch file and increased visibility of mouse wheel remark