Usually QGS101 or QGS102 is thrown when importing _ prefixed modules.
_3d is currently an exception to this rule, so we should not throw an
error when importing it. Importing just 3d would throw and SyntaxError
because 3d is not a valid package name because of the leading digit.
_3d is the only way to use the 3d module.
Should be merged after #10.
Usually QGS101 or QGS102 is thrown when importing _ prefixed modules. _3d is currently an exception to this rule, so we should not throw an error when importing it. Importing just 3d would throw and SyntaxError because 3d is not a valid package name because of the leading digit. _3d is the only way to use the 3d module.
Resolves: #9