Negadoctor : Introduce slide film mode

[Jiyone]

After testing it for several weeks, I propose this positive film editing mode into Negadoctor.
This feature allows users to edit their scans of slide film and easily restore exposure issues (especially in high and low density color balance).

• The GUI adapts based on the selected mode (negative or positive).
  Since slide film is not inverted, the color balance settings are reversed between shadows and highlights compared to the negative mode, in order to consistently represent low and high densities across all modes. Parameter names are automatically updated in the Corrections tab, and tooltips are adjusted throughout.

• The calculations for the automatic adjustments of the color balance pipettes for high densities, as well as Paper Black and Print Exposure, have been adapted to work correctly in positive mode.

Note:

As for negative film, the user needs to measure the film base with Dmin and the highest density area with Dmax.
In positive mode, Shadow / Highlight color balance are inverted. So in slide film mode, the corrective color balance bias in highlights (offset) should be done first, if any, and then the general color balance is made ideally in shadows (gain).

TODO :

• Since keyboard shortcuts name are settings name sensitive, I think I'll rewrite the two functions that renames settings depending of negative or positive film mode. Maybe unify the names as red offset and red gain instead of shadows red offset and highlights red gain, or low red offset and high red gain.
• Look if there is not a better optimisation to do in auto setting code.

[sonarqubecloud]

Quality Gate failed

Failed conditions
27.6% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[sahlirc]

May I suggest that Negadoctor be positioned under the colour tab, rather within its own Film tab, just for the sake of space in the right panel. Of course this may be irrelevant if the Film tab is expected to contain other modules related to film development.

[Jiyone]

It's an intermediate module, and certainly not a color module.