PDS ZAP: Enable handling of PAC file for firefox using templates and assets

[winzj]

Situation

Some authentication mechanisms require multiple steps and some redirects which can be accessible only by proxies. Currently such redirects would fail because the proxy is either set or not.

Wanted

It must be possible to provide a PAC file, which enables the browser to handle proxy settings during redirects dynamically.

Solution

• update the ZAP wrapper application to set the PAC file for the browser on webdriver creation
• update the owasp-zap.sh to handle the file like already done for the authentication scripts
• add documentation, especially because naming of environment variables and paths is important