Trebuchet: add support for statusbar/navbar transparency

Change-Id: Id870e3b75bff8f88b4c1cbccaf817a54061533ac

fix null point bug

Change-Id: I10121e092d985e11aa3236b6dac4c4520fa83b21
Trebuchet: action name changed

Change-Id: I2baedd3994229bf3ebe55329c715d913c017cff2

Trebuchet: action name changed

Change-Id: Ida5505493b3921ae0e10ee64814dff3589dd4ee2
Update German translation.

Change-Id: I939b20784b51efe5043ca2c7289aede388deee33
Merge branch 'cm-10.1' into martincz