player,gui: much better lyrics support

[cosven]

1. support translated lyrics
2. save and restore lyric window settings, including font, bg, fg, geometry
3. auto-scoll lyric view

[coveralls]

Pull Request Test Coverage Report for Build 4763565496

• 235 of 413 (56.9%) changed or added relevant lines in 14 files are covered.
• 11 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.09%) to 61.52%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
feeluown/gui/uimain/player_bar.py	1	2	50.0%
feeluown/gui/widgets/magicbox.py	0	4	0.0%
feeluown/gui/tips.py	8	13	61.54%
feeluown/player/lyric.py	79	84	94.05%
feeluown/app/app.py	14	20	70.0%
feeluown/app/gui_app.py	2	9	22.22%
feeluown/gui/pages/song_explore.py	10	17	58.82%
feeluown/gui/widgets/lyric.py	18	44	40.91%
feeluown/gui/uimain/lyric.py	95	212	44.81%

Files with Coverage Reduction	New Missed Lines	%
feeluown/player/mpvplayer.py	3	60.87%
feeluown/gui/pages/song_explore.py	8	78.51%

Totals
Change from base Build 4753079158:	-0.09%
Covered Lines:	8216
Relevant Lines:	13355

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💛 - Coveralls