Daltonlens

Fixes:

- High-dpi monitors are now supported on Windows and Linux.
- Fixed the hard-to-read text background on bright colors.

macOS specific:

- Improved the font quality on retina displays.
- Help dialog to notify about Screen Recording permissions.

Changes:
* The tritanopia filter is now using the much more accurate Brettel, Viénot and Mollon 1997 algorithm.
* Added a severity slider for the simulation / daltonization modes.
* Added a menu entry + Ctrl-S to save the filtered image.

First cross-platform version of DaltonLens (macOS, Windows, Linux/X11).

Main changes:

- The UI has been reworked to add a separate controls window with more info, a menu, etc. This is also a way to avoid using ImGui viewports as they are still experimental on Linux.

- Fix the daltonize filters to use the proper math from Viénot, Brettel & Mollon 1999 adapted to sRGB. Also fixed the tritanopia projection along the way.

- New option to only simulate color vision deficiencies instead of a full daltonize

- The color pointer has been improved to be more compact and support the 'c' shortcut to copy the information to the clipboard

- The image window can now be freely resized.

- Significant refactoring under the hood to make it easier to add new filters and unit test them.

First cross-platform version of DaltonLens (macOS, Windows, Linux/X11).

Main changes:

- The UI has been reworked significantly to add a separate controls window with more info, a menu, etc. This is also a way to stop using ImGui viewports as they are still experimental on Linux.

- The color pointer has been improved to be more compact and support the 'c' shortcut to copy the information to the clipboard

- The image window can now be freely resized.

- Significant refactoring under the hood to make it easier to add new filters and unit test them.