Updates & fixes

#696 fsm/hfsm self-transitions
#702 etl::message not trivially_copyable
#744 Feature request: Get time when next timer will expire etl::callback_timer
#745 Assertion triggered in hash.h when compiling for MSP430
#746 Missing etl::legacy::variant overload of emplace with 0 Arguments
#748 armcc error on vector::insert
Fixed unexpected pool release behavior when the pool is empty
Added C++03 compatible etl::move and etl::move_backward
Allow C++03 delegate in etl::callback_timer
Change to require semicolons after debug count macros
Re-enabled tests for etl::string_ext
Removed redundant #includes
Added MutexMessageRouter example