Resolve "Refactor debug messages from System.out to SLF4J"
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- René Schöne authored
- made handlers to templates so that inside variable content is possible - refactored every System.out and System.err message to variable method, currently either sout/serr or slf4j - added config parameter to Compiler, with console being default - updated docu - todo: update preprocessor-testing to not require handler-jadds as input anymore