Original TV platform fork with refactored Inputs, config.schema.json, and updated eiscp fork

[solowalker27]

Before submitting your PR, please review the following checklist:

• CHOOSE CORRECT BRANCH: if filing a bugfix/enhancement use master branch
• TEST: run "npm test" before commiting
  My branch doesn't have tests at the moment.
• TEST MORE: run "npm install" to check if you dependencies are OK
• LIST ISSUES this PR resolves
  Directly addresses:
  Merge back (ToddGreenfield & SoloWalker) projects into ToddGreenfield as looks like Todd is now actively maintaining original codebase (will cross post) solowalker27/homebridge-onkyo#13
  Merge back fork (ToddGreenfield & SoloWalker) projects into ToddGreenfield as looks like Todd is now actively maintaining original codebase (will cross post) #70
  Can't use TX-NR676 #75

Touches code around and thus potentially addresses (this should at least be looked at again after this):
#74
#72
#71
#68
#63

• [-] KEEP PR small so it could be easily reviewed.
  Due to how far our forks have drifted, not sure this will be considered "small".
• AVOID making unnecessary stylistic changes in unrelated code

As requested by several people, this PR would merge back in my fork where I originally added HomeKit TV support and converted to a Homebridge Platform. I have refactored the Input code so it's now (hopefully) more understandable and maintainable as well as more compatible with ui-x, including coming with a config.schema.json that works. I also found a more recent node-eiscp fork that had updated model list, increasing the number of explicitly supported and potentially compatible models.

[cbrandlehner]

@solowalker27 I see that this PR is based on an older version. Even fixed typos in the readme are going to be reintroduced with this PR.
However, if you plan to maintain this project I am willing to help. Do you need me to do anything? I assume you have the right to merge the pull request by your own.
If you need help to publish the project to npm I can help, I have the necessary rights given by Todd, but can not delegate these.

[solowalker27]

Yes, this is just my original fork for HomeKit TV support before your changes, with a couple minor updates and tweaks. That was just easiest and quickest for me to do since I’ve been using it the whole time and it’s been working fine for me. I can see if I can make time to look into the issues you’re having and try to fix them directly, or perhaps apply more targeted changes from my fork. I’m not sure if that would be faster and easier or if trying to adapt your tests, typo corrections, and other contributions back into my fork. I’ll see what I can do in the near future.

[solowalker27]

Closing in favor of #80