Move the .cht definitions out of colorchecker.h to textfiles

[TutajITeraz]

Is your feature request related to a problem? Please describe.
I cannot add my own pigment-based checker card to darktable.

Describe the solution you'd like
Half solution:
Move the .cht definitions out of colorchecker.h to textfiles (as a csv, json or .cht file) so everyone could add own color calibration cards by adding new files to the folder.

Full solution:
Add GUI color checker card editor. It could be usefull for the darktable-chart too.

PLUS:
Add button to run darktable-chart from main darktable app. (Usefull for flatpack version).

Alternatives
Now i need to edit the src/common/colorchecker.h file manually and recompile darktable. It is not possible due to #17854 issue.

[Donatzsky]

Already proposed - and rejected - in #8705

[TutajITeraz]

Dear @Donatzsky this is not the same case.
I'm a painter and I'm using high quality pigments with known LAB values.
I have access to the official x-rite color card and calibration tools. This is not about cheap chinese replacements. I just want to calibrate to different pigments that are not present on the common used color cards.

[Jiyone]

It could be the same as the in/out color profiles, those added in the folder will be loaded in the module's profile list.
I use transparency IT8 charts for slide film and that could help.