Missing type variables in bytecode signatures

The bytecode signatures generated by ExtendJ don't include type variables in all cases where Javac adds type variables.

For example, this class:

public class Jac1 <T extends Integer> {
  public Jac1(T t, T[] ta) {
  }
}

Has the following bytecode signatures when compiled with ExtendJ:

public class Jac1<T extends java.lang.Integer> {
  public Jac1(java.lang.Integer, java.lang.Integer[]);
}

When compiled with Javac, it has these signatures:

public class Jac1<T extends java.lang.Integer> {
  public Jac1(T, T[]);
}

This seems to only be affecting constructors. Type signatures are generated for methods and fields, but missing for constructors.

Generate type signatures for constructors

fixes #269 (bitbucket)

→ <<cset 7c0a01210749>>