TODO:

 - [X] Fix c.fill issue
 - [] Create Element structure with pads and connections
 - [] Get a list of GStreamer elements in dialog add plugin
 - [] Draw element with its pad
 - [] Be able to move the element on Screen
 - [] Create connection between element
 - [] Run a pipeline with GStreamer
 - [] Run the pipeline with GStreamer
 - [] Control the pipeline with GStreamer
 - [X] Define the license
 - [] Connect the logs to the window
 - [] Create a window for the video output