Yes, you can add them manually but you really should look into git, it is MUCH easier than modifying files.
Moving coreBOS to another directory (correctly changing config.inc.php) should not affect anything, definitely not cbupdater which is (more or less) a normal module.
Go to the online demo. Access the a record or create a new record in the global variable module.
You will see the GVarDefinitions block. I added the definitions of these to variables there, with their values, defaults and explanation.
No, sorry, I didn't look at the image.
Please use the online demo, your code is not up to date with the latest changes.
It is VERY important to follow our development using git. We make changes, fixes and enhancements EVERY day, it makes no sense to do releases or version numbers and it is just to easy to do keep up with git and cbupdater.
Please confirm that you see the block in the online demo with the explanation.
the one you reference is coreBOSCRM, not coreBOS. I can update that one if you want to but I prefer to keep the forum talking about coreBOS as much as possible.