Extension to send error messages to a configurable eMail address

- plugin.info.txt:
- added myself to the list of authors
- updated date to 19-Mar-2021

- editcommit.php:
- pass plugin instanc

Extension to send error messages to a configurable eMail address

- plugin.info.txt:
- added myself to the list of authors
- updated date to 19-Mar-2021

- editcommit.php:
- pass plugin instance to GitRepo cTor
- added error notification helper methods
- catch Exceptions from underlying GitRepo or Git methods
to hide errors from end user rahter than sending error message by eMail

- Git.php:
- Git:
- added plugin instance to methods as paramater
- GitRepo:
- added plugin instance to cTor as parameter

- default.php, metadata.php, settings.php:
- added config 'emailAddressOnError'
- added config 'notifyByMailOnSuccess'

- lang/en:
- added localizations for error messages
- added eMail templates for mail notifocations

Signed-off-by: Markus Hoffrogge <mhoffrogge@gmail.com>

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