Use a gradient sky to improve visibility in shaded areas,
while also helping the user orient themselves. The bottom of the sky
is black, while the top of the sky is white.
This change also makes it so that the Default Clear Color project setting
no longer affects the Advanced Import Settings dialog.
Adds `rest_pose/external_animation_library` advanced option to replace bone rest with an exported Animation before retargeting.
Together this allows a purely importer based workflow to transfer a known good pose from one FBX to another.
Adds a bool import option `nodes/import_as_skeleton_bones`.
This is supported in all FBX or GLTF document based formats.
It is especially useful for retargeting and importing animations.
This change introduces a new EditorThemeManager class
to abstract theme generatio and its subroutines.
Logic related to EditorTheme, EditorColorMap, and editor
icons has been extracted into their respective files with
includes cleaned up.
All related files have been moved to a separate folder to
better scope them in the project. This includes relevant
generated files as well.
