- implemented BENCH make option

- introduced object state cache
- introduced blink element
- introduced delay attribute to objects

- fixed animation delay if update takes longer than the delay
- using backgrounds also in 8-bit fullscreen mode to improve performance
- implemented screen layer to improve performance
- corrected offsets and tab widths in main menu
- implemented parameters "current", "mark" and "selected" to choose mark colors
  in replay display (defaults to the old values)
- implemented color value "None" to be able to unset a color

  (but will still work like usual). On such devices, a full-screen 8-bit
  OSD will be used
- new display-item "PresentTextDescription" displays combined
  ShortText/Description
- displaying replay symbols only if information is actually available
- exchanged x, y, width, height with x1, y1, x2, y2 coordinates
  (skin version is now 0.0.3)
- coordinates may be negative to respect dynamic OSD settings
  (negative coordinates give pixels from the right or bottom edge)
- added base parameter to Skin item to be able to use full screen in absolute
  mode
- added a script to convert 0.0.2 skins to 0.0.3
- added parsing quoted texts (path="Bla.jpg" etc. will work correctly now)
- fixed translator to escape the dollar sign
- fixed display of scrollbar (REALLY!)
- fixed linkage of libMagick++