Allows adjacent cells to be merged in layout manual table items.
From the table editor, select multiple cells in a rectangular
shape and then from the Table menu, click "Merge Selected Cells".
Merged cells can be un-merged via the "Split Selected Cells"
menu action.
Fixes#51694
individual table cells in manual text tables
Allows users to set the text horizontal and vertical alignments
on a cell by cell/column/row basis
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