Fixes broken dependencies in code, thanks to@byzek in#77. Needs more specific versioning in Docker components.

Adds up to IOS XR 7.0.1, IOS XE 16.12.1, and NX-OS 9.3(1) models.
Fixes pyArango upstream git bug.

Bump to v2 due to significant change in how YANG XPaths are stored and displayed. XPaths were previously tied to a specific rendering which didn't have enough fidelity to handle the different potential permutations e.g. IOS XE vs IOS XR vs gNMI target being OpenConfig vs... This change to how XPaths are parsed during ETL enables us to derive the different permutations of XPaths necessary for correctness, at the cost of direct correctness in the data layer and pushing it to the presentation layer.

Checkpoints v1.x progress and bugfixes as a release.

Primarily, adds documentation hosted alongside TDM versus in this repo.

Initial release, semi-feature complete albeit missing some desired functionality.