Don't de-reference invalid iterator (and no point in doing anything
with an empty style sheet list anyway).

some id and string renaming from b08e2730 was reverted, those parts of the changes are reapplied here

This reverts commit 83a28682.

- iterators should be compared with !=, not <
- iterator invalidation on erase should be avoided by using the
  iterator that is returned by erase
- in WrongList::operator== only one iterator was incremented

Also, change the contained text slightly.
Thanks to William Gathoye for noticing and producing a first patch

With big thanks to Lapo Calamandrei for his willingness to relicense his Save and Save As icons.

Copyrights:
icon-themes/tango/cmd/[l,s]c_reload.png and icon-themes/tango/res/[l,s]c05508.png are from the Public Domain Tango artwork available under tango.freedesktop.org/releases/tango-icon-theme-0.8.90.tar.gz

icon-themes/tango/cmd/lc_save.svg
icon-themes/tango/cmd/[l,s]c_save.png,
icon-themes/tango/cmd/[l,s]c_saveas.png,
icon-themes/tango/cmd/[l,s]c_savebasicas.png,
icon-themes/tango/res/[l,s]c05502.png,
icon-themes/tango/res/[l,s]c05505.png are
(C) Lapo Calamandrei, as available from http://git.gnome.org/browse/gnome-icon-theme/, relicensed to LGPL3+/MPL

Move everything that requires ObjectiveC stuff to the ObjC++ files in
the aqua subdirectory, where it belongs.

Another code-review follow-up fix from fdo#44533 - don't use
Sequence::getArray, that tends to create a new copy everytime you
call.

Follow-up fix for 540963d8
std::algos use iterator arguments by value, and may change them.

This fixes fdo#44533.