fixed caret scrolling on startup

* Since Scintilla no longer automatically scrolls the caret (see 941f48da6dde691a7800290cc729aaaacd051392),
  the caret wouldn't always end up in the view on startup.
* Added teco_interface_refresh() which includes SCI_SCROLLCARET and
  is invoked on startup. This helps with the Curses backend.
  It also reduces code redundancies.
* On Gtk, the caret cannot be easily scrolled on startup as long as no size is allocated
  to the window, so we also added a size-allocate callback to the
  window's event box. Sizes are less often allocated to the event box than to the
  window itself for some strange reason.

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