An IntelliJ IDEA plugin that adds the option to generate a copy constructor to the "Generate" menu (alt + insert), as suggested in IDEABKL-5546.

Roughly based on the comparisonChainGen example plugin.

It comes with experimental intentions that warn if a copy constructor may be buggy, such as when:

• The copy constructor does not copy all fields from one object to the other
• A field assignment in the copy constructor looks bogus (this.x = copy.y; or this.x = constant;)
• The copy constructor in a subclass does not invoke the copy constructor in the superclass