First draft of a jump-to-definition query

TODO: flesh out this message

ql/test/query-tests/analysis/Definitions.rb

@@ -0,0 +1,26 @@
+module A
+  class B
+    def f
+      g 1
+    end
+
+    def g x
+      x
+    end
+
+    def h
+      f
+    end
+  end
+end
+
+module C
+  class D
+    def h y
+      A::B.new.g y
+      UnknownClass.some_method
+    end
+  end
+end
+
+C::D.new