*  split into subpackages axi4 and axi4lite
*  moved each module into its subpackage
*  shortened names by removing Axi-prefixes wherever possible
*  moved Configs and IOs into corresponding companion object
*  replaced some printlns/printfs with Logging facilities

* size parameter indicates automatic address wrapping
* no need for resets in between (not always feasible)
* wraps on overflow to current value of `base` input

* addresses should only be handshaked when data is actually avaiable /
  needed; previous logic would provide addresses as fast as possible
* this fixes problems with handshaken addresses at other modules when
  adapter is being reset

* addressess in transactions should be supplied as fast as possible
* waiting for the transaction to finish is not necessary and harms
  performance
* not sure if this implementation is ok; there could be a large gap
  between address handshake and data - if this blocks the slave it
  must be fixed (further tests required)

* now has single FIFO of configurable size
* burst size is configurable separately
* burst is started as soon as burstSize is exceeded in buffer
* decided against even more aggressive mode of starting immediately,
  since that would likely be detrimental to system performance
* adapted and verified all unit tests

* WSTRB now correctly adapts to dataWidth (all bytes enabled)

* did not work correctly for different dataWidths
* also size parameter in burst address was not set correctly:
  need to specify full-width bursts

* adapter to write data from Decoupled-Fifo as AXI4 master
* base address supplied as input
* all widths configurable
* FifoAxiAdapterTest1 uses DecoupledDataSource to test with
  constant data set
* can also be used to verify against AXI BFMs