Validate props, 🔪 all args

[rmfarrell]

Bug

I think the currentargs is overloaded and doesn't validate incoming data. This causes misconfigured yaml files from clay to fail silently or without really helpful error messages, and it makes the kiln internal code a bit hard to reason.

Proposed Solution/Implementation

I think we should stop using this prop in favor of passing property values to the component individually. Vue has built-in property validation right at the component level, where you'd want it.

[nelsonpecora]

merging this into #1310