EEditorSelection: Rename selection markers
EEditorSelection: Try to get the font format just in HTML mode
EEditorSelection: Return right value when asking for Strikethrough format
EEditorSelection: Rename strike-through to strikethrough
EComposerPrivate: Block selection-changed signal when adjusting caret position after signature insertion
EEditorSelection: Rework Monospaced font style handling

The usage of TT element was replaced with <font face="monospaced">.
Selection is now not lost on enabling/disabling the monospaced font.
Also when disabling the monospaced font style apply all other font styles to
newly written text (don't loose the other formatting).
EEditorWidget: Remove unnecessary code
EEditorSelection: Fix compiler warning
EEditorHRuleDialog: Fix insering of new HR
EEditorDialog: Don't use GDK_WINDOW_TYPE_HINT_POPUP_MENU for dialogs

Use GDK_WINDOW_TYPE_HINT_NORMAL that is default instead.
EEditorDialog: Close dialog when Escape is pressed
EEditorTableDialog: Rework the insertion of a new table
EEditorImageDialog: Fix "follow" unit for image resize
EEditorSelection: When inserting new image mark EEditorWidget as changed
EEditorWidget: Don't remove smiley image representation when changing composer mode
Implement image resizing in HTML mode with CSS

Right now it allows just resizing above original sizes due to WebKit bug
https://bugs.webkit.org/show_bug.cgi?id=72948
EEditorWidget: Introduce spellchecking function for current paragraph
EEditorWidget: Clean elements and attributes when coverting from HTML to plain
EEditorWidget: Fix parsing of html text into paragraphs

Sometimes there could be spaces before the BR element.
EEditorWidget: Create paragraphs only when we have something to put there