Updating TTS engine interface for setting the language based on language, country and variant codes

    // @return TTS_SUCCESS, or TTS_FAILURE

    virtual tts_result loadLanguage(const char *value, const size_t size);

    // Signal the engine to use the specified language. This will force the

    // language to be loaded if it wasn't loaded previously with loadLanguage().

    // See loadLanguage for the specification of the language.

    // @param value pointer to the language value

    // @param size  length of the language value

    // Load the resources associated with the specified language, country and Locale variant.

    // The loaded language will only be used once a call to setLanguageFromLocale() with the same

    // language value is issued. Language and country values are coded according to the ISO three

    // letter codes for languages and countries, as can be retrieved from a java.util.Locale

    // instance. The variant value is encoded as the variant string retrieved from a

    // java.util.Locale instance built with that variant data.

    // @param lang pointer to the ISO three letter code for the language

    // @param country pointer to the ISO three letter code for the country

    // @param variant pointer to the variant code

    // @return TTS_SUCCESS, or TTS_FAILURE

    virtual tts_result setLanguage(const char *value, const size_t size);

    virtual tts_result setLanguage(const char *lang, const char *country, const char *variant);

    // Retrieve the currently set language, or an empty "value" if no language

    // has been set.