New Flat Dark Theme for OBS Studio

New Flat Dark Theme for OBS Studio v1.4

Support for OBS Studio 22.0.x and 23.x.x

- fixed status bar background
- fixed source groups collapse and expand button
- fixed background of some text/number input
- fixed vertical Volume Slider
+ rounded up buttons, dropdowns and inputs
+ made preview background darker

Preview.png
+Vertical slider styles
+Button checked styles
+Dropdown arrows
+Change slider handle hover bg color
- Button backgrounds now transparent
- Toolbar background now same as Dock background
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