iwc common channel UI.

channel 상태에 따른 UI

• empty source
  Closed/Rect added.

• Set source

• Opened

  • handle is created
  • ready
    (when stream is ready, set Swapchain)
  • first frame is decoded
  • play freams

• Disposed

mode에 따른 UI

• edit mode

• activated
• unactivated

UI menu items

• Select checkbox
• playmode on/off
• Info. on/off
  • Status
  • graph
  • stream info