VIS: changed statsdisplay layout

- added a StatsGroup to display statistics in the same manner as metric
& general runtimes
- changed some titles and added a new "Control" title to clarify
different areas
- made changes to the configuration to adapt to the new statsgroup
- changed default configuration to be in playback-mode
VIS: fixed a bug with visualizer sizings

- the bug prevented to create visualizers with smaller sizes then those
used in the default config
VIS: small config changes