Add 500 Error on `View::renderError()`
Add 500 Error on `View::renderError()`

Add 500 error on `View::renderError()`

When Database fails or Exceptions occur, concrete5 returns a 200 OK
response.

- Add php `header()` call to set 500 header

avdevs/concrete5,matt9mg/concrete5,TimDix/concrete5,MichaelMaar/concrete5,MichaelMaar/concrete5,matt9mg/concrete5,avdevs/concrete5,MichaelMaar/concrete5,TimDix/concrete5,TimDix/concrete5,matt9mg/concrete5,avdevs/concrete5