add a privacy configuration to ignore any location/referer data

[tttp]

the default behaviour of the widget is to register the utm params (if present on the url) or generate a "pseudo utm" based on the referer if not, and to register information about where the widget is embeded (location)

in the case of the referer, the url is stripped of any potential personal information (eg any query/get param) to only contain the url.

The source data aren't personal information, but for added privacy, we need to introduce a config.register.source.false that will ignore all these parameters when registering the action.

It is not the default configuration nor the a recommended setting, but it's there ;)