updated bluetooth plugin. can communicate with obd2 now.

added functions : 
	- enable
	- disable
	- isEnabled 
	- pair 
	- unpair
	- connect
	- list bound devices
	- unbound 
	- write and read 
	
some functions are validated. the connect function is only hardcoded, so
it doesn't work somewhere else, don't try. 

plugin need to call the UI when : 
	- a device was discovered
	- paired devices were found