Forget all reliable packets on network shutdown

Prevents strange case where one instance of a game could connect to
itself.

src/pc/network/network.c

@@ -177,6 +177,7 @@ void network_update(void) {
 }
 
 void network_shutdown(void) {
+    network_forget_all_reliable();
     if (gNetworkType == NT_NONE) { return; }
     if (gNetworkSystem == NULL) { LOG_ERROR("no network system attached"); return; }
 

src/pc/network/packets/packet.h

@@ -63,6 +63,7 @@ u32 packet_hash(struct Packet* packet);
 bool packet_check_hash(struct Packet* packet);
 
 // packet_reliable.c
+void network_forget_all_reliable(void);
 void network_send_ack(struct Packet* p);
 void network_receive_ack(struct Packet* p);
 void network_remember_reliable(struct Packet* p);

src/pc/network/packets/packet_reliable.c

@@ -33,6 +33,10 @@ static void remove_node_from_list(struct PacketLinkedList* node) {
     free(node);
 }
 
+void network_forget_all_reliable(void) {
+    while (head != NULL) { remove_node_from_list(head); }
+}
+
 void network_send_ack(struct Packet* p) {
     // grab seq num
     u16 seqId = 0;