v1.20.8

Fix #490 - Correctly replace tag in custom notifications

Add .eslintrc.yaml to define the code style standards for better formatting.

Ran eslint against the entire project to get all code in a standardized format

Begin cleaning up old code that was not using best practices. Still have a bunch to do on this front but things are much cleaner now.

Add firstRun entry into the Settings collection which will give the ability to perform specific actions the first time Plexrequests is started up.

Various minor bug fixes