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>
Remove requirement of NMEA talker ID being 'GP'
Merge pull request #1197 from larsjohnsen/NMEA_TalkerID_all

Remove requirement of NMEA talker ID equaling 'GP'
Merge pull request #1194 from koenkooi/qt5.1

GCS: remove Qt5.2ism
Initial support for Draco board in GCS

This is basicaly just copy of quanton and will be modified!
target draco: first bootable version

It lives and communicates with GCS and has functional bootloader. A lof of work still needed.
MPU9250: first version of driver

Without magnetometer. Gyros & accels works.
MPU9250: magnetometer support

It looks like it's working well
Fixed RTC clock divider value
MPU9250: polish driver and move common register defs to mpu60x0.h
MPU9250: pios_mpu9250.c renamed to pios_mpu9250_spi.c
fix whitespaces
draco: added support for onboard OSD
draco: make sendSync() static
draco: OSD MCU leds controlling