Implement support for intents a gallery app should handle

[Lmh170]

Currently, the app cannot handle all necessary intents. These are basically all intents AOSP Gallery supports:

• android.intent.action.GET_CONTENT
• android.intent.action.PICK
• android.intent.action.VIEW
• com.android.camera.action.REVIEW
• android.intent.action.ATTACH_DATA
• android.intent.action.SET_WALLPAPER
• android.hardware.usb.action.USB_DEVICE_ATTACHED
• android.intent.action.EDIT
• action_nextgen_edit

One should also consider adding:

• android.provider.action.REVIEW
• android.provider.action.REVIEW_SECURE
• com.android.camera.action.TRIM
  
• com.android.camera.action.CROP