Split `hls` functionalities in smaller parts
- fetch M3U8 object `fetch_index()`
- read th indexes `read_*_index_object()`
Move that "pipeline" in `__init__::load_variant_sources()`
Remove `code` field `Variant` and replace it with a video quality
descriptor (resolution and frame rate).
Split `api` functionalities in smaller parts
- fetch API JSON object `fetch_api_object()`
- read the config object `read_config_player_object()`
Move that "pipeline" in `__init__.py`
Remove `code` field `Rendition` and replace it with some track rendition
models that are build from parsing the `code` from ArteTV. Also move the
`protocol` from the `RenditionSource` to the `Rendition` model itself...
who knows how we might handle it in the future.
Split functionalities in smaller parts
- fetch the html code `fetch_page_content()`
- extract JSON data from html code `extract_page_data()`
- read the program info from page data `read_page_data()`
Move that "pipeline" in `__init__.py`
