To get a better functionality we need to know the button type (left,
right, middle). We also need the key modifier (ctrl, alt, shift) for
actions such as ctrl+click (to open a link) or shift+click to select

(cherry picked from commit c90c08a6)

Conflicts:
	libreofficekit/Library_libreofficekitgtk.mk
	libreofficekit/source/gtk/lokdocview.cxx
	libreofficekit/source/gtk/tilebuffer.hxx

Change-Id: Iaccb93b276f8a6870dd41cc5132dbb85d2bbf71b