command en: Add explicit message when selecting music failed

plugin: Improve playlist time function

config: Use default raspbian lite music folder as default

plugin: Add function to get playlist time

plugin: Add a function to say the number of music in the playlist

plugin: Add function to get the current music name

plugin: Improve volume handling

plugin: Fix volume check issue

plugin: Add volume handling

plugin: Add return code to init function

plugin: Add more explanation when music path is invalid

plugin: Add comments and add function to select specific music

plugin: Add pause functionality

plugin: Change the way jarvis say things (not in function)

startup: Update playlist during Jarvis initialization