new kernel threads added: kSysTmr and kIdle
schedStart(): becomes void f(void), has greater responsibility
new API functions: esThdPost() and esThdWait()
Moved some of the macros to the implementation and added new SYSTMR
macros
Kernel locking and unlocking is now much more efficient
Idle thread is a bit more complex for now
new macro PORT_SLEEP() is needed
added esSysTmr_T type and configuration option
FIX: wrong preprocessor condition