Added 2 new files, graphicsview-common.h/cpp, that should have
the common stuff shared between the dive profile viewer and
the dive planner. the amount of duplicated code would be huge
if we go the road of two different classes for each one, but
since the planner took a more 'Qtish' way of behavior, in
comparisson to the profile - that's most a Cairo-To-Qt literal
translation, we cant easily merge the code without a complete
( and unwanted ) reestruturation of the profile code, thus,
this new files will serve as a bridge between them. Initially
I put there only the colors - since that's wat most easilyy
shareable.
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>