Fix some bugs

bossbar-format: ""
bossbar-default-enabled: true/false
fix some bugs

%musicplayer_music_name%
%musicplayer_music_current_time%
%musicplayer_music_total_time%
%musicplayer_music_lyric%"
only install placehoderAPI to use it.

Supported versions: 1.18-1.21.7
Versions below 1.19 may have a small number of errors, ignore them.

Configurable API：
======
#Search for music cooldown time (seconds)
# JSON parsing configuration
# API configuration /musicplayer search %word% %choose%
# Do you want to enable the lyric function
======