[kde-edu]: Sharing QtMmlWidget

[Alexander Rieder]

Hi,
I plan to implement MML rendering in Cantor for results and in comment cells. 
Therefore I'd like to reuse the QtMmlWidget that is also used by KAlgebra. 
Currently it is inside the KAlgebra/src directory so it is not available for 
easy reuse and I have to use a local copy. Therefore I'd like to propose to 
move this widget to libkdeedu (or is there some better place?).
Any comments, objections?

best regards,
Alexander