Fixed: index out of range in Lrc.sync_lrc()
Fixed: transition-property is not supported in Gtk3.4 CssProvider
Code style changed to obey PEP8 guide
open_folder() moved to Utils module
Italic font style removed
Fixed: failed to move items in a playlist, reported by @wangjiezhe. Cached playlist is removed. It is faster to append thousands of songs to a playlist.
v3.2.6 released