Improved validation for rop networks

[t3kt]

Currently ROPs have input type validation, but it only shows up as script errors on inner comps inside them.

It would be good to be able to have a comprehensive view of all validation issues in a network.

[t3kt]

Types of validation:

• Input types
• Required inputs
• Conflicting parameters
• Version mismatches

[t3kt]

Reopening to cover improvements to how validation errors are surfaced