User uploades and improvements

• adding new SentData Event in FormBase for User uploads (for Photo, Audio, Video, Contact, Location, Document)
• adding RequestUserLocation and RequestUserContact to Device class
• Update to Device class
• updating examples
• adding example for data upload
• small documentary Updates (Readme.md)

Bugfixes and improvements (v1.3.1.2)

• Small fix in Systemcall management
• system calls now async with await
• added start command to example
• added "handled" property to system call event args

1.3.1.0

• Added easy to use Proxy functionality into constructor
• improved DeviceSession
• added IsGroup property to DeviceSession

Update

Updated system call management
parameters are now easier available
example project added parameter example