Moved scratchpad definition to script.

* Allows automatic startup of a scratchpad terminal upon starting Xorg.
* Dwm uses the script now.
Minor fixes.

* Corrected the laggy behaviour of urxvt by removing 'depth:32'.
  => Also corrected 'bold = bright white' problem.
* Fixed path for urxvt perl extensions.
* Fixed boldness of elements in the vim statusbar.
* Fixed not-to-background of the scratchpad instantiation in .xinitrc.
  => Xorg always remained blocked until the scratchpad was closed.