Code changes and organization

[folmate]

@lenaRB
As discussed during our last meeting, I starter cleaning up some of the changes I made.

So here is the first batch of changes (preserving java 1.8)

• Code is split into 4+1 packages
  • crml.compiler: Code related to translating CRML to Modelica
  • crml.langauge: Code related to parsing CRML
  • crml.omc: Code related to running OpenModelica
  • crml.test: Test related stuff (I hope to eventually move it to /src/test/java)
  • crml: Application code (main)
• Parsing CRML models should be done with crml.language.Parser. It has static functions to parse input from File, Path, String and CharStream. Latter 2 expect the textual model, not a textual path. Return type is a ParserResult that wraps the related artifacts. (It was originally a record, but that is not available in Java 1.8.)

I have a few more question for the continuation:

• How strict is the requirement to use Groovy for Gradle, instead of Kotlin? (I find Kotlin a bit better and I already moved my version to it.)
• Is it ok to separate the project to submodules for language and compiler?
• Can I make the changes to move the test from main to test? I plan to make the calls for the specific tests to make if that is ok.
• I'm thinking about how I can address the missing language features from later Java version.
  • Is there a specific IDE that we use? Some tools only work with IntelliJ nicely and otherwise it just makes a mess.
  • Would it be a problem if parts of the code were in Kotlin? (It has most of the convenient features and should be easy to make it target the Java 1.8 JVM.)

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