GCS: Fix for QComboBox focus bug in UAVObjectBrowser on Mac OSX

QComboBox's focus policy was changed in Qt 5 on Mac to make it
feel more native. Because of this the QComboBox only opens
briefly on click and collapses again immediately. An easy
workaround is to setFocusPolicy(Qt::ClickFocus) or
setFocusPolicy(Qt::WheelFocus) on the combobox before returning
it from createEditor().

Signed-off-by: James Cotton <peabody124@gmail.com>
GCS: minor UI tweak to the status bar icon tray margins

Signed-off-by: James Cotton <peabody124@gmail.com>
Qt5: rename some files to fix windows build

If this works, I will have no idea why.
GCS: fix data type to qint16 instead of int16_t
GCS: update more uint8_t types to quint8
Revert "GCS gpsdisplay:Added stdint.h to fix compilation"

This reverts commit ac2b1ae6722e96b7657da46b3dd2ab6760b2b630.