Draft: Flint: Provide dark theme
This MR uses a third party library to provide a dark style for Flint.
Could be useful for science by night, anyway it is not perfect.
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Save as preference -
The custom spec style have to be fixed -
There is a lot of icons to update to make it really clean -
The histogram readability could be improved (this maybe have to be fixed in silx side)
Edited by Valentin Valls