major interface conversion update

- module instances with modport bindings are now inlined
- support for modports in generate loops
- support for generic interfaces
- implied modport instance propagation
- add error message for interface instances missing port list

test/basic/interface_module.sv

@@ -0,0 +1,32 @@
+interface InterfaceA;
+    logic x;
+    modport M(input x);
+endinterface
+
+interface InterfaceB;
+    logic y;
+    modport N(input y);
+endinterface
+
+module ModuleA(modport_a);
+    InterfaceA modport_a;
+    initial $display("ModuleA %b", modport_a.x);
+endmodule
+
+module ModuleB(modport_b);
+    InterfaceB modport_b;
+    InterfaceA interface_a();
+    ModuleA module_a(interface_a.M);
+    initial $display("ModuleB %b", modport_b.y);
+    assign interface_a.x = 0;
+endmodule
+
+module ModuleC;
+    InterfaceB interface_b();
+    ModuleB module_b(interface_b.N);
+    assign interface_b.y = 1;
+endmodule
+
+module top;
+    ModuleC module_c();
+endmodule