[keyboardlayout] Add Greek QWERTY

Greek QWERTY keyboard layout. All accented characters are under "symbol,shift+symbol". No space for the capital accented characters though.
Merge pull request #5967 from host505/patch-2

[keyboardlayout] Add Greek QWERTY
Revert to software decoding for AVC profile 578 as it is not handled by imx6 VPU
EGL: Add Quirk for display recreation
IMX: Announce EGL_QUIRK_RECREATE_DISPLAY_ON_CREATE_WINDOW to fix refreshrate change
Merge pull request #5966 from fritsch/imx-helix-ports
DXVA: add HD4xxx to ati work-around, only capable of opening a single decoder at a given time
Merge pull request #5971 from FernetMenta/hd4000

DXVA: add HD4xxx to ati work-around, only capable of opening a single de...
Merge branch 'Helix' of https://github.com/xbmc/xbmc into Helix