Merge: Rename Project to Package

Before `project.ini` are generalized (and regenerated in `c_src`) we should decide if the renaming worth it.

* a package, in OS and for some programming languages, is a coherent and distributed piece of software.
* a package, in software engineering (UML, Java), is a group of elements. It is used as namespace, and can be nested.
* a project, in IDE (eclipse, XCode) and toolchain (maven) is the organization of source of a software and how to build, test, document, etc.
* a project, in software engineering, is an attempt to produce a piece of software (and often the associated resources and artifacts like source code and people)

Thoughts?

Pull-Request: #1669
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>
Reviewed-by: Etienne M. Gagnon <egagnon@j-meg.com>