Initial code for COffice

COffice is a trimmed down Calligra Suite with focus on mobile.
That name is a working name and may change.
This is work in progress and NOT ready or even usuable yet. Its the first step towards a goal.

The goals are:
* This introduces a new directory named calligra/coffice.
* Within taht directory happens all the related work on COffice.
* Buildsystem is qmake rather then cmake.
* This introduces the coffice/fake lib that allows COffice to be qt-only (no kde or other dependencies).
* Focus is atm on Calligra Words.

Work done:
* Most of Calligra libs (flake, koplugin, kotext, koundo2, maim, odf, textlayout, widgets, widgetsutils) compiles and links on Desktop and Android.
* Some plugins (textshape, variables, pictureshape) compile and link on Desktop and Android.
* All of Words compiles and links on Desktop and Android.
* Starting the (non functional) app works (no crashes). Not more yet.

Work to do:
* KDE Plugins. For that I will work next on a QPluginLoader based impl.
* Fixing all the problems that will show up while making the simple viewer-app proper render a ODT document.
* The current app is only used for testing. Plan is to investigate the possibility to put all of the app(s) into an own thread that pushes to a render thread (Qt4, in Qt5 QtQuick2 gives the render-thread out of the box) and to look if Calligra Active can be extended/reused/used as app.