Enhancements to annotation rendering via ETA

[brimoor]

The following new parameters have been added to eta.core.annotations.AnnotationConfig (and thereby usable when running the visualize_labels module or visualize_labels pipeline):

The only non-backwards compatible change is that all object attributes will now be rendered as a panel.

Object attribute rendering

• object_attrs_render_method = ["list", "panel"]: the method used to render object attributes. Previous behavior was list. New option is panel, which renders object attributes in a panel in the same way that frame attributes are rendered. I find this far easier to grok, so I made panel the new default

Handling of occluded objects

• occluded_object_attr: the name of the boolean attribute indicating whether an object is occluded. Typically this is occluded
• hide_occluded_objects = True/False: whether to hide objects when their occluded_object_attr takes the value False

Handling of boolean attributes

• hide_false_boolean_attrs = True/False: whether to hide boolean attributes when they are False, rather than rendering <attr>: False

Hiding of specific attribute values

• hide_attr_values = <list>: an optional list of video/frame/object attribute values to NOT RENDER if they appear in the labels. A typical use of this is to hide attributes whose value is unclear

Example of how object attributes now look in panel-mode (the new default):

Same labels as above, but hiding unclear attributes:

[tylerganter]

I added an additional flag show_object_attrs to toggle object attributes. Some minor comments but otherwise looks great!