Format code to comply with DW standard code style rules

- add code formatter definitions:
- .editorconfig
- .vscode/settings.json

- update code to meet code style:
- conf/default.php,
con

Format code to comply with DW standard code style rules

- add code formatter definitions:
- .editorconfig
- .vscode/settings.json

- update code to meet code style:
- conf/default.php,
conf/metadata.php,
lang/de/settings.php,
lang/en/settings.php:
- fix for white space code style

- classes/*.php:
- attach classes to plugin specific namespace
- format to meet DW code style
- refactor method names to fix PSR1.Methods.CamelCapsMethodName.NotCamelCaps

- loader.php:
- add autoloader for plugin specific namespace classes

- action/editcommit.php:
- replace use of deprecated DW class definitions
by non deprecated class definitions
- followup code formatting of classes/*.php
- make use of auto loader loader.php

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