Depending the received symbol the tree is traversed towards the leafs.
At each step the corresponding decode-able character is appended at a
string buffer.
TODOs:
* Add logic in the decoder to retrieve the decoded words from the tree
* Create a debug source block
The morse decoder is not yet functional. The decoding is performed
using a binary tree. Left child, corresponds to a received dot whereas
right to a received dash.
Manolis Surligas