ui: convert the SDL2 frontend to keycodemapdb

ui: convert the SDL2 frontend to keycodemapdb

The SDL2 scancodes are conveniently identical to the USB
scancodes. Replace the sdl2_scancode_to_qcode table with
an automatically generated table.

Missing entries in sdl2_scancode_to_qcode now fixed:

  - 0x32 -> Q_KEY_CODE_BACKSLASH
  - 0x66 -> Q_KEY_CODE_POWER
  - 0x67 -> Q_KEY_CODE_KP_EQUALS
  - 0x74 -> Q_KEY_CODE_OPEN
  - 0x77 -> Q_KEY_CODE_FRONT
  - 0x7f -> Q_KEY_CODE_AUDIOMUTE
  - 0x80 -> Q_KEY_CODE_VOLUMEUP
  - 0x81 -> Q_KEY_CODE_VOLUMEDOWN
  - 0x85 -> Q_KEY_CODE_KP_COMMA
  - 0x87 -> Q_KEY_CODE_RO
  - 0x89 -> Q_KEY_CODE_YEN
  - 0x8a -> Q_KEY_CODE_HENKAN
  - 0x93 -> Q_KEY_CODE_HIRAGANA
  - 0xe8 -> Q_KEY_CODE_AUDIOPLAY
  - 0xe9 -> Q_KEY_CODE_AUDIOSTOP
  - 0xea -> Q_KEY_CODE_AUDIOPREV
  - 0xeb -> Q_KEY_CODE_AUDIONEXT
  - 0xed -> Q_KEY_CODE_VOLUMEUP
  - 0xee -> Q_KEY_CODE_VOLUMEDOWN
  - 0xef -> Q_KEY_CODE_AUDIOMUTE
  - 0xf1 -> Q_KEY_CODE_AC_BACK
  - 0xf2 -> Q_KEY_CODE_AC_FORWARD
  - 0xf3 -> Q_KEY_CODE_STOP
  - 0xf4 -> Q_KEY_CODE_FIND
  - 0xf8 -> Q_KEY_CODE_SLEEP
  - 0xfa -> Q_KEY_CODE_AC_REFRESH
  - 0xfb -> Q_KEY_CODE_CALCULATOR

And some mistakes corrected:

  - 0x65 -> Q_KEY_CODE_COMPOSE, not duplicating Q_KEY_CODE_MENU

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20180117164717.15855-2-berrange@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>