Kwplayer

* Automatically show playlist tab after startup; reported by saiatsai
* Fixed: GtkWidget.is_visible() is unavailable in gtk3.4; reported by coslyk
* Fixed: unpack tooltip from left-side panel

* Fixed: failed to save playlist; reported by MJsaka
* Fixed: add a scrolledWindow to wrap playlist treeview; reported by saiatsai
* Fixed: Support Karaoke mode
* i18n updated

* Fixed: unescaping html markups in artist name and album name
* Fixed: `return` and `yield cannot mix together in python3.2 and before; reported by Inocr
* i18n updated; reported by MJsaka
* Fixed: make sure PLS_JSON(playlist file) exists; reported by Inocr

* Cached playlist is removed
* Italic font style is removed
* It is faster to append thousands of songs to a playlist
* Fixed: failed to move songs in a playlist, reported by wangjiezhe
* Fixed: transition-property is not supported in Gtk3.4.
* Fixed: index out of range in Lrc.sync_lrc()

* Add tooltip to control buttons
* Fixed: reset to default background when there are no background images available
* Fixed: reset select_all button when show_artist() is called
* Speed up cache service
* gir1.2-notify-0.7 was added to dependencies list
* Change highlighted lyrics text color to black
* Support lyrics background seeking
* Easier to control fullscreen mode
* Show control panel only when mouse moves on top side in fullscreen mode
* Disable access control of X11 server (in python3-keybinder-1.1.2) when needed

* Fixed: add two parameters to _failed_to_download()
* Fixed: GtkButton has no `always_show_image` property before gtk3.6; reported by leavfin
* Fixed: hide control box in Aritst tab after inited
* Fixed: range() arg 3 must not be zero, in Lrc tab
* Fixed: ID3NoHeaderError accurs when there is no ID3 header in an mp3 file.