Rename exception classes

Refactoring of custom exceptions classes with full comments

Delete unused IncompleteMessageException class
Move WhatsAppEvent class to Events folder and namespace

Remove unused and deprecated event listener legacy adapter

Delete deprecated functions on WhatsAppEvent class

Refactor classes, add missing comments and fix incorrect comments
Refactor classes, add missing comments and fix incorrect comments
Refactor BinTreeNode classes, add missing comments and fix incorrect comments
Start to refactor main class, add missing comments and fix incorrect comments
Refactor class, add missing comments and fix incorrect comments