iterators

[Casper Boemann]

Success - but not committed yet

I have now created new merged iterators and changed all usage of the old and 
basic iterators to the new merged ones. (most usage was in filters - someone 
please check that they work)

Also my (basic iterators) are no longer available through the paintdevice only 
the new merged iterators. That is, the factorymethods have changed to return 
the new merge iterators ( and please note that the order of args for 
createHLineIterator() have changed to x,y,w and no longer x,w,y (I have 
changed all usage, but if you have local code you better check, as no warning 
will be given)

The factorymethods for the old iterators are naturally gone as well.

So neither the basic nor the old iterators should be used - only the new 
merged. You can still, without any overhead, use the merged iterators as if 
they were basic. You can also still use the pixel and quantum functionallity 
of the old iterators.

The old functionallity is preserved in the KisIteratorPixelTrait class

And for example: KisRectIteratorPixel inherits from both the 
KisIteratorPixelTrait and the basic KisRectIterator

THINGS MISSING: the oldPixelValue() of the trait is still not fixed from the 
AUTOLAYER merge. Also the infinite iterators are still not there and the mask 
no_mask variants are not ported either.

The kis_iterators.* files are gone
The kis_quantum_iterators.* files are gone
Instead we have the kis_iteratorspixeltrait.h
The kis_iterators_pixel.* are still there but with different contents 
(wrappers for KisRectIteratorPixel etc)

The lineiterators are gone, and so are the IteratorUnit.

diff and new files attached - so everybody please audit - and answer quickly 
as I'll be away friday noon till sunday noon and it would be nice to commit 
before then.

best regards
Casper Boemann
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