added package enum item name resolution (resolves #16)

test/basic/package_enum.sv

@@ -0,0 +1,12 @@
+package foo_pkg;
+    typedef enum logic [2:0] {
+        AccessAck     = 3'd0,
+        AccessAckData = 3'd1
+    } inp_t;
+endpackage
+
+module top;
+    foo_pkg::inp_t test;
+    assign test = foo_pkg::AccessAck;
+    initial $display(test);
+endmodule

test/basic/package_enum.v

@@ -0,0 +1,5 @@
+module top;
+    wire [2:0] test;
+    assign test = 3'd0;
+    initial $display(test);
+endmodule