* add sdb vendor & device ID
* Improve checking when appending registers or fields
* Append fields with a specific index
* Create test unit for EWBReg and EWBPeriph

We still need to

* improve overflow checking
* add full 32bit Fixed Point support
* throw exceptions when bad constructor parameters

* The structure is almost define
* The first unit-tests have been added
* The compatibility with asynWBPortDrvr has been broken.

The memory to retrieve should be the offset of the last register + the
register size (4)

Comments & Trace were also improved to ease debugging