Fix Scroll Text Alignment Drawing Issues

[ghzdude]

What

fixes scroll text drawing incorrectly when using center or bottom alignments
noticable when not calling alignment(), as the default alignment for richtext is center left

Implementation Details

extend text renderer to override getStartY()
also make lastX and lastY accessible

Outcome

scroll text widget draws properly regardless of the alignment used

[Zorbatron]

This makes it so the text is always aligned to the top. IMO for bottom or center alignments, it should start off in the center or bottom, and only "align" to the top once there are enough lines to fill the vertical space.

[ghzdude]

This makes it so the text is always aligned to the top. IMO for bottom or center alignments, it should start off in the center or bottom, and only "align" to the top once there are enough lines to fill the vertical space.

this has been implemented

it's also technically possible to set the scroll based on alignment, but it makes the code more complicated and idk if it'd be desirable.