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_generic.sv

@@ -0,0 +1,72 @@
+interface InterfaceA;
+    task hello;
+        input integer inp;
+        $display("Hello from InterfaceA %0d", inp);
+    endtask
+    logic [20:0] x = 21'b01011_00100000_01011110;
+endinterface
+
+interface InterfaceB;
+    task hello;
+        input integer inp;
+        $display("Hello from InterfaceB %0d", inp);
+    endtask
+    logic [10:0] x = 11'b011_11110100;
+endinterface
+
+// could get bound to any of the interfaces or modports
+module Module(interface i);
+    initial #4 i.hello(1);
+    initial #5 $display("Module got %b", i.x);
+endmodule
+
+interface InterfaceM;
+    logic [4:0] x = 0;
+    task hello;
+        input integer inp;
+        x = x + 1;
+        $display("Hello from InterfaceM %0d %b", inp, x);
+    endtask
+    modport A(input .x(x[0]));
+    modport B(input .x(x[2:1]));
+endinterface
+
+// could get bound to the entire interface bundle, or either modport
+module ModuleM(InterfaceM i);
+    initial i.hello(-1);
+    initial $display("ModuleM got %b", i.x);
+endmodule
+
+module ModuleWrapperMA(InterfaceM.A i); Module m(i); endmodule
+module ModuleWrapperMB(InterfaceM.B i); Module m(i); endmodule
+module ModuleWrapperM (InterfaceM   i); Module m(i); endmodule
+
+module ModuleMWrapperMA(InterfaceM.A i); ModuleM m(i); endmodule
+module ModuleMWrapperMB(InterfaceM.B i); ModuleM m(i); endmodule
+module ModuleMWrapperM (InterfaceM   i); ModuleM m(i); endmodule
+
+module top;
+    InterfaceM im();
+
+    Module c(im.A);
+    Module d(im.B);
+    Module e(im);
+
+    ModuleM x(im.A);
+    ModuleM y(im.B);
+    ModuleM z(im);
+
+    InterfaceA ia();
+    InterfaceB ib();
+
+    Module a(ia);
+    Module b(ib);
+
+    ModuleWrapperMA cw(im);
+    ModuleWrapperMB dw(im);
+    ModuleWrapperM  ew(im);
+
+    ModuleMWrapperMA xw(im);
+    ModuleMWrapperMB yw(im);
+    ModuleMWrapperM  zw(im);
+endmodule