Move packages into a separate directory

[sajjaphani]

Currently, all the packages are placed in the top-level directory along with some other dirs such as bin, ci, etc.

It would be better to introduce a new directory (src/packages/pkgs, etc any suitable name) and move the packages into this subfolder.

core-plans
│   ---
│   ---
│
└───ci
│   │   ---
│   │   ---
│   │
|  
|   ---
│   
└───src/packages/pkgs
|   │   7zip
|   │   R
|   │   ---
|
|  ---

Note: These changes require the settings of the core-plans plan files to point to the new locations in the builder.
Check for any other changes requires?