Pios queue

* fixes #1284 
* partly fixes #1285 
* fixes #1286 
* partly fixes #1287 
* abstracts away queue from FreeRTOS
* removes FreeRTOS headers and tick macros from pios.h (!)
* use pios_heap exclusively
* fixes a lot of bitwise-or on logical types misusage
* fixes time delta calculation in pios_rfm22b.c
I'd be happier to see core methods like this described with doxygen. Especially details like what is the expected
return type. True for receive or timeout, etc.