RestApiv3: fixes
 - Made API fully CORS compliant (fixed OPTION method params)
 - Fixed new ReactionResource
Adding various helpers like HttpHelper (retrieve HTML, JSON or XML contents from urls); SerialHelper (improved serial ports communication); TcpHelper (tcp socket with timeout)
Quick fix: removed a not used dependency
Quick fix: right click on a plugin shows its GUI again. This is a temp fix, a better fix is to have multiple menus, one for plugin configuration and one to show its GUI
Fix PL-105: Close button on Login Form
SerialHelper: added feature to receive data in chunks of fixed size or ending with a custom string terminator
arduinousb plugin - fixed connection problem - now onDataAvailable() fires
arduino usb plugin - first test with serial provider - not working
arduinousb plugin - moved to serialHelper communication class
arduinousb plugin - added chunk terminator and size properties in manifest file