refactor: ♻️ added zip_path to user profiles

This allows to verify if the mod is still installed by confirming the existence of the zip file. However, this check is only performed when the mod is not loaded and a path to the zip file exists. This ensures that mods are not deleted from the profile when running in the editor. It's important to note that this new check may cause mods to appear in user profiles even if they are currently not loaded. To determine if a mod is actually loaded, you should also check `ModLoaderStore.mod_data` or use `ModLoaderMod.is_mod_loaded()`.

closes GodotModding#288

addons/mod_loader/api/profile.gd

@@ -273,6 +273,28 @@ static func _update_mod_list(mod_list: Dictionary, mod_data := ModLoaderStore.mo
 			# If the current config doesn't exist, reset it to the default configuration
 			mod_list_entry.current_config = ModLoaderConfig.DEFAULT_CONFIG_NAME
 
+		# If the mod is not loaded
+		if not mod_data.has(mod_id):
+			if (
+				# Check if the entry has a zip_path key
+				mod_list_entry.has("zip_path") and
+				# Check if the entry has a zip_path
+				not mod_list_entry.zip_path.empty() and
+				# Check if the zip file for the mod exists
+				not _ModLoaderFile.file_exists(mod_list_entry.zip_path)
+			):
+				# If the mod directory doesn't exist,
+				# the mod is no longer installed and can be removed from the mod list
+				ModLoaderLog.debug(
+					"Mod \"%s\" has been deleted from all user profiles as the corresponding zip file no longer exists at path \"%s\"."
+					% [mod_id, mod_list_entry.zip_path],
+					LOG_NAME,
+					true
+				)
+
+				updated_mod_list.erase(mod_id)
+				continue
+
 		updated_mod_list[mod_id] = mod_list_entry
 
 	return updated_mod_list
@@ -298,7 +320,13 @@ static func _generate_mod_list() -> Dictionary:
 static func _generate_mod_list_entry(mod_id: String, is_active: bool) -> Dictionary:
 	var mod_list_entry := {}
 
+	# Set the mods active state
 	mod_list_entry.is_active = is_active
+
+	# Set the mods zip path if available
+	if ModLoaderStore.mod_data.has(mod_id):
+		mod_list_entry.zip_path = ModLoaderStore.mod_data[mod_id].zip_path
+
 	# Set the current_config if the mod has a config schema and is active
 	if is_active and not ModLoaderConfig.get_config_schema(mod_id).empty():
 		var current_config: ModConfig = ModLoaderStore.mod_data[mod_id].current_config