Remove yield macro

[256dpi]

The yield macro is very ambiguous and therefore conflicts with other libraries that use yield as a symbol.

Now, if other included code uses the identifier yield it gets replaced by the macro. We currently have this issue with the 256dpi/arduino-mqtt#56 library.

The best approach would be to declare a function that simply forwards the call:

// Before
#define yield() vPortYield()

// After
void yield() {
  vPortYield()
}

[me-no-dev]

done :)

[256dpi]

Thanks!