Add more missing icons for GtkhtmlEditor.

The GtkhtmlEditor HTML toolbar uses some legacy stock icons:

	stock_insert-rule
	stock_insert-table
	stock_text-monospaced

Technically these belong in the GtkHtml package.  Couple reasons why I'm
not doing that.

1) Evolution should be the only consumer of GtkhtmlEditor at this point,
   and when we finally dump GtkHtml for WebKit I expect the composer UI
   to stay basically the same.  So GtkhtmlEditor will have to be gutted,
   renamed, and moved into Evolution, along with the legacy icons.  So
   they're going to end up here in the long run anyway.

2) GtkHtml doesn't ship any of its own icons currently, so I'd have to
   reconstruct all the autotools scripts for icons already in Evolution,
   figure out a sensible install path, make sure GtkIconTheme knows to
   look for icons there, etc.  Just not worth the hassle.

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