Add esp_plugin_record_and_group_count() FFI function

It'll be used instead of esp_plugin_count_override_records() to get the
record count used during sorting Morrowind load orders, since esplugin
can't count override records for Morrowind plugins.

ffi/src/plugin.rs

@@ -246,6 +246,25 @@ pub unsafe extern "C" fn esp_plugin_is_empty(
     .unwrap_or(ESP_ERROR_PANICKED)
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn esp_plugin_record_and_group_count(
+    plugin_ptr: *const Plugin,
+    count: *mut u32,
+) -> u32 {
+    panic::catch_unwind(|| {
+        if plugin_ptr.is_null() || count.is_null() {
+            ESP_ERROR_NULL_POINTER
+        } else {
+            let plugin = &*plugin_ptr;
+
+            *count = plugin.record_and_group_count().unwrap_or(0);
+
+            ESP_OK
+        }
+    })
+    .unwrap_or(ESP_ERROR_PANICKED)
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn esp_plugin_count_override_records(
     plugin_ptr: *const Plugin,

ffi/tests/ffi.cpp

@@ -161,6 +161,23 @@ void test_esp_plugin_is_empty() {
   esp_plugin_free(plugin);
 }
 
+void test_esp_plugin_record_and_group_count() {
+  printf("testing esp_plugin_record_and_group_count()...\n");
+  Plugin * plugin;
+  auto return_code = esp_plugin_new(&plugin, ESP_GAME_SKYRIM, "../../testing-plugins/Skyrim/Data/Blank.esm");
+  assert(return_code == ESP_OK);
+
+  return_code = esp_plugin_parse(plugin, true);
+  assert(return_code == ESP_OK);
+
+  uint32_t count;
+  return_code = esp_plugin_record_and_group_count(plugin, &count);
+  assert(return_code == ESP_OK);
+  assert(count == 15);
+
+  esp_plugin_free(plugin);
+}
+
 void test_esp_plugin_count_override_records() {
   printf("testing esp_plugin_count_override_records()...\n");
   Plugin * plugin;
@@ -225,6 +242,7 @@ int main() {
   test_esp_plugin_description();
   test_esp_plugin_header_version();
   test_esp_plugin_is_empty();
+  test_esp_plugin_record_and_group_count();
   test_esp_plugin_count_override_records();
   test_esp_plugin_do_records_overlap();
   test_esp_plugin_is_valid_as_light_master();