GCS: remove Qt5.2ism

QComboBox::currentData was introduced in Qt 5.2 and all the other
comboboxes in the gcs code use the old

	comboBox->itemData(comboBox->currentIndex());

form anyway. .

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Sparky: check in assembly page
Remove requirement of NMEA talker ID being 'GP'
DiscoveryF4: add pinout.txt file.

Signed-off-by: Giuseppe Barba <giuseppe.barba@st.com>
Merge difference from FlyngF4 platform.

Signed-off-by: Giuseppe Barba <giuseppe.barba@st.com>