Visualization: Don't automatically publish humanoid visualization for deixis and attention

[ekaszubski]

Deixis and attention visualizations currently rely on humanoid data to generate parts of their visualization. However, this causes redundant subscribers and publishers to be created. Proposed fix:

• Remove VisualizationAdapter for Humanoids message within attention/deixis visualization
• Add VisualizationAdapter for Humanoids message to semio_visualization_server_node
  1. Either use subscribe mode and have attention and deixis pull humanoids out of this adapter OR
  2. Use non-subscribe mode, add HumanoidSourceAdapter to semio_visualization_server, and have humanoids, attention, and deixis visualizations pull humanoids out of the resulting HumanoidSource

[ekaszubski]

Opting for:

use subscribe mode and have attention and deixis pull humanoids out of this adapter

[ekaszubski]

Implementing in #23

[ekaszubski]

Implemented in #23