(fwZip): add "encryption" support when reading and writing jsonz archives

What does this MR do?

This Mr add encryption and update internal minizip to version "1.2". For now, the "secret" key is hardcoded in SReader and SWriter. This will of course be changed in another MR.

How to test it?

• Launch unit tests (especially fwZipTest).
• Launch an application and load and save .apz
• Launch an application and load and save .cpz

To use ".cpz", you must add:

<archive backend="cpz">
    <extension>.cpz</extension>
</archive>

in your plugin.xml

Associated Issues/Merge Requests

• Issues
  • Fixes #480 (closed)