[Pingus-CVS] Further splitting of WorldObjs aka backgrounds

[David Philippi]

Everything in /worldobj is no splitted into /worldobjsdata + /editorobjs.
Right now I've found that the files in /backgrounds should be splitted too - 
here I see three approaches:
a) like /traps: move everything into /worldobjs[data], /editorobjs
b) creating a /worldobjs[data]/backgrounds, /editorobjs/backgrounds + a 
namespace backgrounds
c) creating a /backgrounddata, /backgroundobjs

Preference decreases from a) to c) for me since I consider a grouping by name 
(XBackground, XBackgroundData, XBackgroundObj) to be enough.

Bye David