first steps to a fully semi-automated settings system

[Tomaz Canabrava]

and I think I need to clarify something,
if we didn't had the prefs.h, I could have made a QObjectification of the
settings there is much, much smaller than the one I did right now (around
1.6k LOC) because for each variable of the prefs struct ( and it's
substructs ) I needed to do:

a Q_PROPERTY (type name READ name WRITE setName SIGNAL nameChanged)
for that specific property
a getter that is mostly an one liner, return prefs.something;
a setter that creates a QSettings, updates it, and also updates the prefs
variable and emits the changed signal
a signal to be emitted

if we didn't had the prefs struct (or if it was a C++ class instead of a C
Struct) I only needed to do the Q_PROPERTY (type name MEMBER var_name)

so - maybe it's something to consider in the far - far - far future?

either way, Here is the usage of the 1.6k LOC monster for the toolbar
buttons that trigger the replot of the profile: (it already helped to
simplify the handling of it, yey)
I'm not pretty sure that this is bug free, but I tested this together with
master so there isn't any obvious bugs.

Tomaz
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