qmltc: reject enums in inline components

Reject (for now) enum declarations in inline components: those enums are unusable even in the qml engine as they cannot be used neither inside nor outside the inline component they were defined

The syntax to using a value of the enum would be

QmlFileName.InlineComponentName.EnumType.EnumValue // from different qml file, does not work currently
InlineComponentName.EnumType.EnumValue // from same qml file, does not work currently
EnumType.EnumValue // inside the inline component defining this, does not work currently

See also QmlFileName.qml in attachment.