Remove code for connecting noodles

include/ui.h

@@ -7,6 +7,8 @@
 #include <stdbool.h>
 
 #define MAX_UI_ELEMENTS 8192
+#define RESERVED_UI_SLOT 0
+#define UI_ELEM_START_INDEX 1
 
 #define BUTTON_WIDTH 100
 #define BUTTON_HEIGHT 40
@@ -28,7 +30,10 @@ enum ui_elem_type {
 
 struct ui_elem {
   u64 id;
-  rect rect;
+  union {
+    rect rec;
+    line ln;
+  };
   ui_elem_type type;
 };