TYPO3 Core

Remove the possibility for extensions to provide
error and exception handling configuration in
ext_localconf.php of an extension. This only worked
anyway only for errors or exceptions at a later point
in the bootstrap. We now by definition make it only possible
in LocalConfiguration.php (or AdditionalConfiguration.php).

In addition make the configuration more reliable and understandable:

• Register error handler even if exception handling is not configured.
• Remove option 2 for displayErrors option
• Configure everything only once and early in the bootstrap.