v0.3.0-pre-alpha (Interpreter mostly complete)

This release is a pre-alpha milestone intended only for historical purposes. This version of Jacobin executes many simple and some complex Java classes, instantiates objects, and calls methods across classes and in libraries. However, there are still many limitations that need to be removed, basic features to be added, and despite the presence of 440+ tests, the Jacotest test bed, and other testing frameworks, it needs more testing to make sure of the robustness of existing features.