- implemention of the headerbar functionality (new function headerbar_click) - the function replace_bitmap() tranfers the dst.x value of the old bitmap   to the new one
- implemention of the headerbar functionality (new function headerbar_click)
- the function replace_bitmap() tranfers the dst.x value of the old bitmap
  to the new one

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet