- changes the file loading and saving for contacts, messages, and
  preferences files, from the UWP API's async file functions to c++
  standard fstream functions

Change-Id: If8ccf4d276573474fd34091deb8785accec5113c
Tuleap: #1051

- adds saving contact specific conversation to a json file

- loads the json file into the conversation object when loading
  the contacts list

- generates a UID for the contact to avoid name collisions, which
  is stored in the contact data file

Change-Id: I8a7b757d09b270e65c4d264805934faf8466c09f
Tuleap: #980

Change-Id: I49fae020f196ffa5450d414bcce5ded0c1d0c092
Tuleap: #971

- adds conversation class and conversationMessage class.

- adds to each contact a conversation member wich will store the messages history.

Change-Id: Icdab0e2345ef2889057c06d965ff0eb2940c5a27
Tuleap: #943

- adds files for account model and view model.
- adds files for contact model and view model.
- adds controls for the smartlist pan.
- adds some stub assets.

Change-Id: I7e5b0cc5d29ac777bce13d1b7db1b6b847513d62

- adds all project and solution files.
- adds styles file.
- adds localization files for Us-en and Fr-fr.
- adds UI skeleton.
- adds filters.
- adds a console.
- adds .gitignore for UWP apps.
- contains some "stub" assets required.
- extends the client area to the toolbar.

Change-Id: I125efe3d38e12829e0479b1bfbac31fb1deff0e1