Add static and inline to getter in all qPref header files
Remove call to GET_PREFERENCE_* in qPrefDisplay.cpp
Remove GET_PREFERENCE_* from qPrefPrivate.h
static inline is slightly faster than a function call, but it saves
a lot of coding lines (no lines in qPref*.cpp). Getters are a direct
reference to struct preferences, so they will normally only be used
from QML.
Signed-off-by: Jan Iversen <jani@apache.org>
3eae683b57