remove os/time references from live programs, fix warnings

examples/hot_reload/bounce.v

@@ -31,6 +31,8 @@ fn main() {
 		dy: 2
 		height: height
 		width: width
+		main_wnd: 0
+		draw_fn: 0
 	}
 	window := glfw.create_window(glfw.WinCfg {
 		width: width
@@ -49,6 +51,7 @@ fn main() {
 		height: height
 		font_size: 20
 		use_ortho: true
+		window_user_ptr: 0
 	})
 	println('Starting the game loop...')
 	go game.run()
@@ -63,26 +66,39 @@ fn main() {
 
 const (
 	width = 50
+	red   = gx.rgb(255,0,0)
+	green = gx.rgb(0,255,0)
+	blue  = gx.rgb(0,0,255)
 )
 
+// Try uncommenting or changing the lines inside the live functions.
+// Guess what will happen:
 [live]
 fn (game &Game) draw() {
-	game.gg.draw_rect(game.x, game.y, width, width, gx.rgb(255, 0, 0))
+	game.gg.draw_rect(game.x, game.y, width, width, blue)
+	//	game.gg.draw_rect(game.x, game.y, width, width, gx.rgb(128,10,255))
+}
+
+[live]
+fn (game mut Game) update_model() {
+//    game.x = 0 game.y = 0 game.dx = 1 game.dy = 1
+//    game.dx = 3 game.dy = 3
+	speed := 2
+	game.x += speed * game.dx
+	game.y += speed * game.dy 
+	if game.y >= game.height - width || game.y <= 0 {
+		game.dy = - game.dy
+	}
+	if game.x >= game.width - width || game.x <= 0 {
+		game.dx = - game.dx
+	}
 }
 
 fn (game mut Game) run() {
 	for {
-		game.x += game.dx
-		game.y += game.dy
-		if game.y >= game.height - width || game.y <= 0 {
-			game.dy = - game.dy
-		}
-		if game.x >= game.width - width || game.x <= 0 {
-			game.dx = - game.dx
-		}
-		// Refresh
+		game.update_model()		
+		glfw.post_empty_event() // Refresh
 		time.sleep_ms(17)
-		glfw.post_empty_event()
 	}
 }