TTableWidget/TTableWindow issues

I have a project using TTableWidget / TTableWindow, and finding some annoyances. This item to track fixes.

• Divide-by-zero in TTableWidget.bottomRightCorner() when resizing to a very narrow width
• Need a setTableDimensions(int columns, int rows) method so that TTableWindow subclasses can easily fix the underlying table. (It can be done a bit laboriously with insert/delete rows/columns, but that kinda sucks.)
• TTableWindow.getTableWidget()
• TTableWindow needs more constructors, e.g. so that it can be modal.
• TTextPictureWindow should also get more constructors.
• TTableWidget should have a way to NOT scroll off to the right.
• Read-only cells should still get movement keystrokes so that one can see whatever is scrolling off to the right.
• There is a rendering glitch where cells that should be clipped are still displaying the first letter.
• Expose ROW_LABEL_WIDTH (getRowLabelWidth() / setRowLabelWidth()) so that the row labels "column" width can be set.
• Add methods to automatically set column width and row label width.