Matlab-proxy

**Full Changelog**: https://github.com/mathworks/matlab-proxy/compare/v0.1.0...v0.2.3

Contains:
1. Bugfixes on UI elements that presented the state of the integration.
2. Support for SSL certificates. You can now run MATLAB-PROXY as an https server. See [Advanced-Usage.md](./Advanced-Usage.md) for more information.
3. MATLAB-PROXY now uses the HOME folder instead of TMPDIR to store launch artifacts. This solves : https://github.com/mathworks/jupyter-matlab-proxy/issues/13

Features:
1. Dynamic display port selection. Previously, the integration relied on display `:1` being available; with these changes the next free display is selected and used.
2. Fix 409 error on login page. Occurred when users toggled between Online Login and Server licensing screens.
3. Unit Tests added
4. Internal security patches
5. Infrastructure for proper error messages for Add-On explorer browser window. (Needs more work)

Bug fixes and security patches.

Initial release of MATLAB Integration for Jupyter