kodi_panel v1.34

Added element_thin_line() and strcb_audio_duration() callback functions. The first callback permits a line to be draw on the display, with any starting and ending points, color, and width. The second callback returns the number of colons present in MusicPlayer.Duration, permitting (with the new use of new display_if keys for fields) adjustments based upon whether the final time is short or long.

Added a new 800x480 layout with full screen artwork, in the example_blue_800x480.toml file. I can't decide whether it's too cramped or nice.