Rename JavaVM.GetObject() to JavaVM.GetValue(). #2
Description
Rename JavaVM.GetObject() to JavaVM.GetValue().
Rationale: I want to remove the IJavaObject constraint so that we can do e.g. vm.GetValue<int>(javaLangIntegerHandle) to read a java.lang.Integer into an int (ditto arrays, etc.), and "Object" no longer makes sense when a copy of the value will be created.