The InstallChecker is botched on KSP 1.12.5 and Windows. Need a completely rewrite

[Lisias]

This is getting old. Very, very old.

We have essentially 4 deployment rules nowadays:

1. Before KSP 1.8.0
2. Between [1.8.0 .. 1.11.2]
3. Between [1.12.0 .. 1.12.4]
4. On KSP 1.12.5

And it was an exercise on futility to try to find a common ground between them. It only brought me tears, blood and teeth grinding.

It's time to solve this krap once for all.

Tasks:

• [ ] New tool DeploymentTool will replace InstallChecker that will be, from now on, only a checker.
• [ ] Specify exactly how each fscking scenario above will work
• [ ] Implement these fscking scenarios
• [ ] Check each one on:
  • [ ] Linux
  • [ ] MacOS
  • [ ] Windows

Obviously, the DeploymentTool should not be publishable on CKAN as it would stomp some toes there, so:

• [ ] Code a suicide pill if the tool detects CKAN using the mainstream repository.