Add a script to regenerate the Attributes reference wiki page

As I always need to lookup the exact syntax how to update the Attributes reference wiki page, I put everything in a script, which assumes the wiki is located at ../flare-wiki

Of course we want to ignore that script for releases.
When I cloned the wiki, it was created as `flare-engine.wiki` as opposed to `flare-wiki`. Since `flare-wiki` didn't exist, this script failed when I tried to run it. We should either:

1. Create `../flare-wiki/` and verify that it was created
2. Create `Attribute-Reference.md` in the current directory, and echo a message saying to move it to your clone of the wiki.

I'm in favor of option number 2.