Resizable emulator

[munrocket]

Issue with arbitrary size is critical. Pre-script not working because it runs before AVD created #346

pre-emulator-launch-script: |
  sed -i 's/hw.lcd.density=.*/hw.lcd.density=460/' ~/.android/avd/test.avd/config.ini
  sed -i 's/hw.lcd.height=.*/hw.lcd.height=2556/' ~/.android/avd/test.avd/config.ini
  sed -i 's/hw.lcd.width=.*/hw.lcd.width=1179/' ~/.android/avd/test.avd/config.ini

I am landed PR, how to test it?