Title Text component: "Text layout" setting causes error when set to Left

[tassaron]

Changing the Title Text "text layout" setting to "left" causes this error:

Traceback:
  File "avp/libcomponent/metaclass.py", line 38, in renderWrapper
    return func(self, *args, **kwargs)

  File "avp/components/text.py", line 118, in previewRender
    return self.addText(self.width, self.height)
           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^

  File "avp/components/text.py", line 153, in addText
    x, y = self.getXY()
           ~~~~~~~~~~^^

  File "avp/components/text.py", line 99, in getXY
    raise ValueError(f"Alignment value {self.alignment} unknown")

Which is unsurprising because the code only checks for two options even though there are three. Should be simple to fix.