Main dialog

Adding the main dialog
Changed width of dialog and name of combo

-Changed the width of the dialog from 400 to 380.
-Changed the name of the comboBox from cmbDevice to cmbDevices
Created ui package

-Created "ui" package with the main dialog
Added main file

Added main file
utils packaged

Created "utils" package
ScannerThread class

Created ScannerThread class for obtaining the list of serial devices
availables/connected to the system
PushButton of Scan

Added functionality to the PushButton "Scan" for scan all the available
serial devices