Each Feature tree row now carries Edit, Show/hide and Delete, and each
Bodies row carries Move, Show/hide and Delete. These act on that row
instead of on the selection. The eye shows a closed eye when the item
is hidden. Every clickable icon in the sidebar now highlights on hover.
Rename and Color now come first in the right-click menu, as items of
their own instead of inside Modify. This applies wherever they appear,
whether opened from the viewport or from a Bodies row.
Clicking an already-selected row no longer starts a rename; use F2,
the row's right-click menu, or the Rename command.