Adding 'system.errors.verbosity' to eventually replace 'system.errors.display'

[Perlkonig]

• Introduces three levels of verbosity:
  • 2: Full stack trace
  • 1: Current Grav error page
  • 0: Bare 500 response
• Backwards compatible
  • If verbosity isn't set, then it looks at display.
  • Otherwise, verbosity is taken instead of display.
  • If accepted, I suggest marking display as deprecated for a release or two and documenting the change.
  • Adopting this approach will not break legacy installs. Not updating your config file results in zero change in Grav behaviour.

References Issue #1064 and closed PR #1089. Thanks!

[rhukster]

Thanks!

[rhukster]

as you can see i tweaked your PR a little. basically i removed the new verbosity option and reused the existing display one. By also changing the values to 1, 0, -1 I was able to maintain backwards compatibility with the old true (1) and false (0) values.