Make log server URL configurable.

Created a property, DG.logServerUrl, in core.js. This value is referenced for all server log POSTS. It is presently initalized to '/DataGames/api/log/save'.

This value can be configured in codap-config.js.

[Fixes #74726882]
Adjust server log message to conform to syntax of Data Analytics log server.

Also, make log server URL configurable.
Adjust URL APIs to allow for full url to be provided.
Suppress X-SproutCore-Version header in log POST.
Minor adjustments to log message json to align with new log server.

Part of [#74726922].
Set values in debug.js, construct json in authorization.js

[#74726922]