improved error_message

Merged Robert Schweppe requested to merge 21-make-error_message-behave-like-message into develop
  • refactored mo_message
  • added functionality to error_message to include multiple arguments
  • deleted all usages of text_messages
  • added stump of unit test and removed old test

Closes #21 (closed), #19 (closed)

Edited by Robert Schweppe

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