Refactoring in kcontrol/background

[Nicolas Hadacek]

Hi,

since I have added some methods from "bgrender.cpp" to KImageEffect (will be 
using them in an incoming background setting dialog for kdegames), I can now 
refactor a little code. See the attached patch. Most of the diff is using 
KImageEffect::Disposition enum and doing some related renaming for 
consistency.

Ok to commit ?

see you,
Nicolas
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