[Lmuse-developer] Fixed TopWin and xml errors.

[Tim E. R. <ter...@ro...>]

Fixed TopWin xml errors such as 
"MusE: unknown tag <topwin [or tool or arranger] > at line xxxx". 

Used new TopLevelList::findType(), in MusE::readToplevels() to find 
 arranger, marker, and cliplist. Was broken !

So, arranger now remembers its settings, mostly     :)

Florian, can you verify: When the arranger is a sub-window, then upon
 reloading the song the complete arranger window border is gone, but
 can be easily made to re-appear with say, cascade or tile etc.

But it remembers fine if not a sub-window.  Look OK to you?
  
---

TODO: Fix broken default.med file, still has serious xml errors ! 
And for long time MarkerView hasn't recalled its visibility.

Tim.