* fixes argument limit, argument count is unlimited now. (cherry picked from commit 589296da9044be13f921724e8c2b1312bebde4c8)
* fixes detecting support of <initializer_list> * fixes build on solaris
* improves safety and log speed through: - variadic templates - perfect forwarding * fixes a newline in db logs * improve performance of Appender::write by using std::ostringstream && std::move