pause-indicator: add fluent icon style and border width options

[Samillion]

Changes:

• add icon_border_width option
• add fluent_icons option

The fluent_icons option requires the fluent-system-icons.ttf font file, which is also used for ModernZ osc.

Notes for fluent_icons:

• Pause icon size: adjust rectangles_height option
• Play icon size: adjust triangle_height option
• Respects icon style options: icon_color, icon_border_color, icon_border_width, icon_opacity

mpv
├── fonts/
│   └── fluent-system-icons.ttf (optional) [required for fluent_icons]
├── script-opts
│   └── pause_indicator_lite.conf
└── scripts
    └── pause_indicator_lite.lua