Flehsed out esp walker with callback interface. Implemented header printer using walker.

NavmeshList/main.c

@@ -5,7 +5,7 @@
 #undef NDEBUG
 #include <assert.h>
 
-int main() {
+int main(void) {
 	FILE *fp;
 	errno_t ret = fopen_s(&fp, "Skyrim.esm", "rb");
 
@@ -13,7 +13,7 @@ int main() {
 		return ret;
 
 	fseek(fp, 0L, SEEK_END);
-	long size = ftell(fp);
+	size_t size = ftell(fp);
 	rewind(fp);
 
 	char *buffer = malloc(size);
@@ -23,7 +23,7 @@ int main() {
 	size_t read = fread(buffer, sizeof(char), size, fp);
 	assert(read == size);
 
-	walk(buffer, size);
+	espr_print(buffer, size);
 
 	return 0;
 }