Move plugins to external folder

applications/external/totp/lib/timezone_utils/timezone_utils.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <inttypes.h>
+
+/**
+ * @brief Calculates timezone offset in seconds given timezone offset in hours.
+ * @param hours timezone offset in hours
+ * @return Timezone offset in seconds.
+ */
+int32_t timezone_offset_from_hours(float hours);
+
+/**
+ * @brief Applies timezone offset to a given time.
+ * @param time time to apply offset to.
+ * @param offset timezone offset in seconds.
+ * @return Time with timezone offset applied.
+ */
+uint64_t timezone_offset_apply(uint64_t time, int32_t offset);