BUGS
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- word wrap for objects with lots of non-space needs to search in positive
  direction if begin of first object is reached

TODO
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- use printsetup margins

  - UNDO!!
  - replacement of llist in window

- update rectangle (needs support in wxllist and wxWindows)
  --> needs a bit of fixing still
      some code bits are commented out in wxlwindow.cpp
      offset handling seems a bit dodgy, white shadow to top/left of cursor

- add wxHTML parser to import HTML
- add some kind of callback for objects with userdata
- use wxTempFile to get rid of temporary image files