Consistent naming of folders in libs/ & renaming kundo2 -> koundo

[Friedrich W. H. Kossebau]

Hi,

to remove some complexity and add more patterns to the code structure, both 
for us current developers and even more for future developers trying to grasp 
the landscapes of Calligra code, I will be going to do two things next week 
(around Wednesday 13th) in master:

a) rename the kundo2 lib and all its classes to koundo/KoUndo

b) rename folders in libs/ consistently to match the lib name

   version -> koversion
   widgetutils -> widgetutils
   widgets -> kowidgets
   store -> kostore
   odf -> koodf
   textlayout -> kotextlayout
   kundo2 -> koundo
	main -> komain
	rdf -> kordf
	vectorimage -> kovectorimage


Any issues with that?

Cheers
Friedrich