Add fpp-to-layout tool

[jwest115]

• Added fpp-to-layout tool for generating layout text files for all connections in an FPP topology
• Added unit tests for testing the different types of connections graphs (pattern, direct) as well as multiple topologies and duplicate topologies
• Updated user guide and wiki to include new tool (wiki updates are here)

Closes #524.

[bocchino]

Looks good! We discussed two updates:

1. When generating layout directories, first delete any directory with that name, so we don't have any old files hanging around in the new directory.
2. In the unit tests, rename the layout reference directories to X.ref instead of XRef.

After these changes, it will be ready to merge!

[jwest115]

@bocchino I made the 2 adjustments you noted above and re-generated the test ref files. Let me know if you have any questions, etc.

[bocchino]

Looks good! I see the changes.