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[Java] Fix numeric field names

Merged Administrator requested to merge github/fork/Fjolnir-Dvorak/bug/java_escapingNumbers into master

Created by: Fjolnir-Dvorak

…nerators are escaped now.

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Description of the PR

Somehow the generator started somewhen to generate broken java code if the fields in the openapi spec are staring with a number. Numbers are not allowed at the start of a word in java so they need to be escaped. This bugfix escapes all varNames which start with a number with an underscore like it was sometime before

Fixed Issues:

Technical Commitee for Java:

@bbdouglas (2017/07) @sreeshas (2017/08) @jfiala (2017/08) @lukoyanov (2017/09) @cbornet (2017/09) @jeff9finger (2018/01) @karismann (2019/03) @Zomzog (2019/04)