[TASK] Allow and replace special characters like umlauts

Additional characters or overriding of the built-in map via argument customMap.
[TASK] Relocate viewhelper and add alias
[BUGFIX] Allow non vh assets to add variables md5 to name
Merge pull request #736 from hmspl/assetVariables

[BUGFIX] Allow non vh assets to add variables md5 to name
Merge pull request #734 from bjo3rnf/ze_germans

[TASK] Allow and replace special characters like umlauts
[FEATURE] Context view helpers
Merge pull request #735 from BenjaminBeck/FEATURE_Context_view_helpers

[FEATURE] Context view helpers