Added game configuration files for Doom Builder 2.0

[akaAgar]

Contains all sectors, linedefs and things from EDGE Classic 1.35, properly sorted by category.

Tested with DoomBuilder 2.0, should work will all its forks. Could be useful for level designers.

[LoboEire]

We need to decide what do do with the various Doombuilder configs we've got floating around. We've also got DB.x ones which have been passed around on Discord but not included "officially" anywhere. Can we assume yours are tailored specifically for DB2?

At present we've been focussing more on UDB, which seems to be the most popular map editor currently. We've had UDB ones for quite some time: the DiD ones are actually included with the program.
We haven't added the newest (Did + UDMF) publicly yet but if you're interested you can check this out: https://edge-classic.github.io/tutorials/index.htm

[LoboEire]

I have added configs for UDB and DoomBuilder.x to our repo:
https://github.com/edge-classic/EDGE-classic/tree/master/docs/mapping

I'm fairly sure the db.x ones would also work with db2: if you are using db2, can you try them?

[dashodanger]

I tested our existing DB.X configs with DB2, and they indeed do not work with it; will pull this in and then do some pushes later to rearrange it so that it sits with the other config folders