golangci-lint

add Gizmo widget and example for it #881

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10 errors and 1 warning

commentedOutCode: may want to remove commented-out code (gocritic)

commentedOutCode: may want to remove commented-out code (gocritic)

commentedOutCode: may want to remove commented-out code (gocritic)

Comment should end in a period (godot)

`wnat` is a misspelling of `want` (misspell)

exported: exported type GizmoOperation should have comment or be unexported (revive)

exported: exported type GizmoMode should have comment or be unexported (revive)

exported: exported function NewHumanReadableMatrix should have comment or be unexported (revive)

exported: exported method CustomWidget.Gizmo should have comment or be unexported (revive)

exported: exported function IdentityMatrix should have comment or be unexported (revive)

Failed to restore: "/opt/homebrew/bin/gtar" failed with error: The process '/opt/homebrew/bin/gtar' failed with exit code 2