[feat](gui) paint some buttons instead of using charactor symbol

[cosven]

• Hide the sidebar and playerbar(bottom panel)
• add blur effect for the floating box
  • After a few tries, I found it's hard to implement a good blur effect (it's hard to blur the background text). The QGraphicsBlurEffect can only blur the widget itself. The good news is that we can draw a blured pixmap.
• add a Home button on the top
• show the user avatar or the provider icon on the top 🤔
• review the code
  • refine the process of showing pixmap
• floating box background color

试用体验

1. 播放/暂停歌曲操作有点麻烦（鼠标需要先 hover 到图片，然后移动到按钮上）
2. 浮动窗口上的歌曲名太短（歌曲名最好能在界面上一直显示，而不是需要将鼠标 hover 上去才显示）

[coveralls]

Pull Request Test Coverage Report for Build 5533481590

• 376 of 985 (38.17%) changed or added relevant lines in 26 files are covered.
• 38 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-1.9%) to 59.764%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
feeluown/gui/uimain/toolbar.py	16	17	94.12%
feeluown/gui/uimodels/provider.py	1	2	50.0%
feeluown/gui/uimain/player_bar.py	19	21	90.48%
feeluown/gui/widgets/cover_label.py	4	6	66.67%
feeluown/gui/helpers.py	3	6	50.0%
feeluown/gui/uimain/sidebar.py	18	21	85.71%
feeluown/gui/ui.py	1	6	16.67%
feeluown/gui/components/volume_slider.py	6	14	42.86%
feeluown/gui/pages/recently_played.py	6	16	37.5%
feeluown/gui/widgets/settings.py	5	16	31.25%

Files with Coverage Reduction	New Missed Lines	%
feeluown/gui/uimain/toolbar.py	1	76.39%
feeluown/gui/widgets/settings.py	1	27.54%
feeluown/gui/uimain/player_bar.py	7	91.72%
feeluown/gui/widgets/playlist_button.py	11	0%
feeluown/gui/widgets/provider.py	18	21.24%

Totals
Change from base Build 5209719285:	-1.9%
Covered Lines:	8514
Relevant Lines:	14246

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💛 - Coveralls