0.2.1: IParse: Overload Parse method with String parameter

Add a String version of the Parse method to IParse and SentenceParser
which implements IParse.

0.1: Add Sentence Parser with default \r delimiter

Add IPacket and IParse interfaces which together can be used to create
generic packet parsers.
The first implementation of these interfaces is that of a sentence parser,
namely packets which are delimited by a single or couple of characters.
The default delimiter is \r

IPacket contains a single read method, getString which will return the
parsed string if it has been completed.
IParse has a single Parse method which is used by the caller to add new
incoming data to the packet and an onPacket call back which is called on
completion of a packet.