Method can_be_enabled

library/include/PluginManager.h:170–170

        bool reload(color_ostream &out);

        bool can_be_enabled() { return plugin_is_enabled != 0; }
        bool is_enabled() { return plugin_is_enabled && *plugin_is_enabled; }
        bool can_set_enabled() { return plugin_is_enabled != 0 && plugin_enable; }
        command_result set_enabled(color_ostream &out, bool enable);