Allow nullables and params arrays in console commands

[Govorunb]

Changes made in this pull request

Console commands

• Allow using nullable value types in parameters
  • A command like ToggleSomething(bool? enable = null) can now be registered and can e.g. print the current status of the toggle if called with no arguments
• Allow using a params T[] parameter to consume the rest of the input
  • This allows commands to parse an arbitrary number of (still primitively-typed) parameters
  • Something simple like a command that repeats your input back at you is now extremely easy to define
  • It only makes sense to have one params array and only as the last parameter - which is enforced by the compiler

Breaking changes

• No breaking changes to existing commands from my testing

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[Govorunb]

I have read the CLA Document and I hereby sign the CLA

[Alexejhero]

[LeeTwentyThree]

Very useful, I also appreciate the friendly type names 👍