Propagate settings from Prefences to the EHTMLEditorView

Namely "Use the same fonts as other applications", "Standard Font",
"Fixed Width Font", "Highlight quotations with color", "Automatically
insert emoticon images" and "Check spelling while I type". Also remove
unneded properties from EWebView.
EHTMLEditor - Fix indentation after EEditor -> EHTMLEditor rename
EHTMLEditorActions - Allow the action that shows the spell check dialog
EHTMLEditorSpellCheckDialog - Avoid crash when no iter was set in the dictionaries combo box