* add debugging options to simulator, test more debugging flags, add tests for other launch arguements

* refactor iOS launch arguments to use one function for both simulator and physical devices

* treat dart flags differently between physical and simulator

* Simplify some flags between devices.

Change --disable-service-auth-codes to not always be included for physical devices, only if disableServiceAuthCodes is true.
Change --disable-observatory-publication to be used for simulator devices too.
Change --enable-checked-mode & --verify-entry-points to be used if debuggingEnabled is true regardless of device type.
Chnage --trace-startup to be used for simulator devices too.

* fix ios release mode with buildable app startApp test

* determine observatory-port from deviceVmServicePort and hostVmServicePort

* add comments and remove hasObservatoryPort