Untangle DiveCalculatedCeiling from MainWindow

DiveCalculatedCeiling is the last class the references
MainWindow in the profile-widget stack.

In modelDataChanged() it looks for the information()
widget and sets a slot for the dateTimeChanged() signal that
information() emits.

To solve the issue we make DiveCalculatedCeiling recieve
a ProfileWidget2 reference and make ProfileWidget2 emit
the dateTimeChangedItems() signal.

ProfileWidget2 itself listens for the dateTimeChanged()
signal that information() emits and emits dateTimeChangedItems()
to notify any possible children/item listeners in the
ProfileWidget2::dateTimeChanged() slot.

The connection between ProfileWidget2 and information()
is set in MainWindow. This makes DiveCalculatedCeiling
unaware of MainWindow and which class originally emits
the dateTimeChanged() signal to ProfileWidget2.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
--
Think delegation.

Tomaz, please take a look at this one, to double check
if i messed up.

also i have zero idea how the mobile app is setting these
connections, if it does so even.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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