base: Add QS header styles [1/3]

Gives the user a choice between black, dark grey, light grey and accent based options.

Based on the code of Fruity pebbles and QS tile picker.

@Aston-Martinn | Forward port to Q

Change-Id: Ibe9d0e6c69a42df85a0e37f4d272440be1c07a40
3 files changed