mplayer: move file loading out of main()

The structure is now as follows:
- main():
    * basic initializations (e.g. init_libav() and more)
    * pre-parse command line (verbosity level, config file locations)
    * load config files (parse_cfgfiles())
    * parse command line, add files from the command line to playlist
      (m_config_parse_mp_command_line())
    * call:
        - handle_help_options():
            * check each help-related option
            * print help if requested
            * main() exits if help was requested
    * call function that works down the playlist:
        - play_files():
            * run idle loop (idle_loop()), until there are files in the
              playlist or an exit command was given (slave mode only)
            * actually load and play a file:
                - play_current_file():
                    * run all the dozens of functions to load the file
                      and initialize playback
                    * run a small loop that does normal playback, until
                      the file is done or a slave command terminates
                      playback
                      (each iteration, run_playloop() is called)
                    * uninitialize playback
            * determine next entry on the playlist to play
            * loop
    * call exit_player_with_rc() (there are many other places which
      use this function, though)

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