bug#35481: 25.2; table.el should use 'font-lock-face' instead of 'face'

[Sebastian Urban <mrsebastianurban@gmail.com>]

This is follow up (part two of solution) to this bug#35044:
https://lists.gnu.org/archive/html/bug-gnu-emacs/2019-03/msg01011.html
and then (two months split)
https://lists.gnu.org/archive/html/bug-gnu-emacs/2019-04/msg00739.html
or at debbugs
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=35044

In short "table.el" uses text property 'face' (table-cell) which causes
losing of cell highlight when user switches from modes like "Text" or
"Fundamental" to modes that use "Font lock", like "Outline".  Also when
user switches back, 'face' is not applied immediately in every cell, but
one by one, when cursor is moved from cell to cell.

For both problems a solution seems to be an update to "table.el", which
will change 'face' to 'font-lock-face'.

If it helps, I found 4 places in code that probably need to be changed:
- 'defface table-cell' at line 680,
- 'defun table--put-cell-face-property' at line 5172,
- 'defun table--remove-cell-properties' at line 5189,
- 'defun table--update-cell-face' at line 5209.

---

In GNU Emacs 25.2.1 (i686-w64-mingw32)
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