media: audio visualization support (phase 1)

support audio visualization for typop, tycat
This is just first phase with hard coded type (EMOTION_VIS_LIBVISUAL_INFINITE)

TODO:
1. configurable visualizing type in option
2. hide visualizing option if it is not supported.
   (it's currently supported with "gstreamer" engine)
options: remove unused global variable
refactor keys handling in termio: move to keyin