The whitespaces and the tabs have been removed from the patch, because Aaron has fix that with his latest patch on plasmate

Hello,

This is the first task of my GSoC. I have add the tabbox support to the startpage of the plasmate.

NOTES:

1)The service type of the tabbox is "Kwin/Tabbox,Plasma/Applet", because the Plasma::PackageStructure requires the "Plasma/Applet" in order to be able to be used. Also the plasmapkg and the plasmoidview require the "Plasma/Applet" service type.
2)Some lines doesn't have any differences because i have remove some whitespaces and "tabs"... 

ISSUES:

1)The icons for the tabbox are wrong. I have some issues with my PCs and i cannot open a new session of the KDE.
So i wasn't able to find the icon. Sorry for that.
2)The template of the tabbox that i have put is located in the kde-workspace/kwin/kcmkwin/kwintabbox/qml/main.qml. The main.qml cannot be installed becuase it uses some Q_PROPERTY elements. Any ideas about how to fix that?
3)I think that the starting comments of the tabbox should become better. I would prefer something like the "mainPlasmoid.qml"....