Roadmap for STAPLE 1.0

[modenaxe]

@renaultJB I have created this item in discussion to discuss few ideas for a roadmap.

So for now I have developed the algorithms further in order to have:

1. consistent fields for the outputs of the morphological algorithms (see README)
2. consistent dimensions of the main vectors (V, Origin, etc)
3. an option of creating the models with proper local reference system (both of the geometry and of the joint reference systems)

I think that before releasing a stable version we still need:

1. a solid documentation
2. a patellofemoral joint, or at least the tools to develop it
3. some functions to add muscles

About these points:

1. the sphynx suggestion could really help, especially if we manage to have automatic Actions from GitHub building the documentation again automatically when we push something new.
2. I have updated the patella_GIBOC functions to work in STAPLE (not pushed yet). The patellofemoral joint is still a bit clunky but I think it's a good baseline for us or others to work on.
3. the muscles will be a major features (change of version as well) and I am working on those but they will come out as publications first I think.

In conclusion, I think that once we have points 1. + 2. we can release as v0.1 (stable).
Let me know what you think, I will setup a milestone accordingly, which we can modify later if necessary.