[Custom] configure setting file to customize medInria

[mathildemerle]

The commit : f05491a
PR based on PR 1090 and #1091

One of the goals of medInria4 is an easy customization of the app for external projects using medInria.

The customization system

This PR adds a settings.json file at root of medInria, set for medInria default "style": name, description, icons, logos, release notes, etc. CMake reads this json file and extracts the information, passes them also to medInria c++ parts. These values allow to configure the application.

I added a medInria version of the logo for light background/theme.

This settings file can be adapted as i did for MUSICardio. The devs of an external project of medInria, can create their own repo with dedicated info, to access the settings files easily.

For instance to compile med4 with a rebranding

• git clone medInria4
• enter medInria4, git clone customization repo
• replace the settings file at root of medInria by the one from the customization directory
• build the application

What remains to be done

• i tested on Ubuntu 20.04. I/we need to test on the other platforms
• Specifically on macOS there is the dmg style problem which remains: [dmg] modularity of dmg design #866. I added this system in MUSICardio but it needs to be tested and adapted to medInria configuration

Ⓜ️

[Florent2305]

We must keep this code base but, I don't agree to merge it directly.
I would like to create a new PR based on this one, with changes concerning the CMake part.