Remove Emacs 19 and 20 compat code from table.el

Remove Emacs 19 and 20 compat code from table.el

* lisp/textmodes/table.el:
(table-recognize-cell, table--make-cell-map)
(*table--present-cell-popup-menu, table--update-cell)
(table--update-cell-widened, table--update-cell-heightened)
(table--cell-insert-char, table--warn-incompatibility): Remove
Emacs 19 and 20 compat code.
* lisp/textmodes/table.el (table-disable-menu)
(table--set-timer, table--get-last-command): Declare obsolete.