TODO:

- [x] Fix c.fill issue
- [x] Create Element structure with pads and connections
- [x] Get a list of GStreamer elements in dialog add plugin
- [x] Add plugin details in the element dialog
- [] 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