Add support for maintaining connected noodle when parent node moves

include/nodes.h

@@ -7,11 +7,13 @@
 #define MAX_NODES 1024
 #define IO_INPUT_COUNT 0
 #define OP_INPUT_COUNT 2
+#define EMPTY_NODE 0
 
 typedef i32 (*node_func)(i32 a, i32 b);
 typedef enum node_type node_type;
 typedef union node_data node_data;
 typedef struct node node;
+typedef struct noodle noodle;
 
 enum node_type {
   NODE_TYPE_IO,
@@ -25,13 +27,18 @@ union node_data {
   node_func func;
 };
 
+struct noodle {
+  line ln;
+  u64 connected_node;
+};
+
 struct node {
   rect rec;
   ui_elem_colours colours;
   node_type type;
   node_data data;
   u64 inputs;
-  line *noodles;
+  noodle *noodles;
 };
 
 #endif // !NODES_H

include/ui.h

@@ -7,8 +7,6 @@
 #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