Provide Full Error in Catcher for 500

[snoweuph]

API Docs to Existing Functionality

https://api.rocket.rs/v0.5/rocket/catcher/trait.Handler

Problems with Existing Functionality

Currently the 500 Error Catcher; only gets the Status and &Request like any other Catcher.

The Problem is, that the status.reason() might only be a generic 500 Internal Server Error and not hold an actual stack trace.

This is annoying for development and a problem for production systems, where you want to store 500 with a full stack, for example to disk.

Suggested Changes

Instead of only returning a Generic 500 Error Message, return more Context about what caused a 500

Alternatives Considered

don't use Rockets Catchers, and instead built my own Global Catching system

Additional Context

Look at this:

 >> Matched: (hello) GET /theme
   >> Error rendering Tera template 'feature/theme/view': Failed to render 'feature/theme/view'
   >> Failed to render 'feature/theme/view'
   >> Macro `link_icon` is missing the argument `href`
   >> Template 'feature/theme/view' failed to render.
   >> Outcome: Error(500 Internal Server Error)

Clearly in such a Case a Catcher wants to know why a 500 was thrown.
In production to write it to disk, and in development to render a detailed error page.

System Checks

• I do not believe that this suggestion can or should be implemented outside of Rocket.

• I was unable to find a previous suggestion for this change.