Fix parents of queried paths getting visualized, fix 2D objects not showing at all in 3D if their camera parent is not included

[Wumpf]

What

Fix parents of queried paths getting visualized

The is abouttree_prefix_only (former direct_included, inverted now) not causing visualizer gathering to stop.
We now also grey out everything that doesn't have a visualizer in the blueprint hierarchy. Debatable whether that should be just tree prefixes (i.e. could instead not grey out if a result is the query but doesn't have a visualizer?). I found this behavior nicer since "not having visualizer" is equivalent to being invisible (which also causes greying out)

fix 2D objects not showing at all in 3D if their camera parent is not included

long story short: pinhole_image_plane_distance would default to 0.0 if the camera is not present. Bandaid is to make it default to 1.0 which is better anyways. Hoping this will be solved better once EntityProperties is gone.

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