Array code generation

[hawkw]

Needed:

• [x] Code generation for NewArray
• [x] Code generation for single dimensional array access
• [ ] Code generation for multidimensional array access
• [ ] Code generation (and fake method annotations) for array.length()

Samples;

• [ ] array1.decaf
• [ ] ~~array2.decaf~~ This one fails due to a parse error, I'm skipping it.
• [ ] array3.decaf
• [ ] array4.decaf