Features used are move constructor, unique_ptr, deleted functions, enum class,
lambda expression, and range for loop.

Use a per-line cache to avoid re-computing the offset from the start of
the buffer each time. This dramatically speeds up multiple replacements
on large files.

On GTK2 and GTK3 < 3.3.6 there is no GtkAccessibleClass::widget_unset()
method, so we can't destroy our accessible object right away.  So, to
avoid accessing a destroyed widget, we need to check whether the widget
still exists in the the ScintillaGTKAccessible destructor.

In other methods it's not necessary because the wrapping GObject class
makes sure not to forward other when the widget has been destroyed, but
we still have to destroy the C++ instance no matter what, so the check
has to be on this side.

Really restrict smooth scrolling handling to Wayland.