textBox: use same positioning as Java MW

[#47171687]

Use upper-left corner of frame instead of lower-left
corner of first line of text.
support multi-line textBoxes delimited w/newlines

[#47172851]
chebyshev: align textBox components vertically
new textBox examples: on atoms, imported from mml

[#47150443], [#47172851], [#47171687]