[LinphoneHandler] make sure we do not make any calls to LinphoneCore once destroy is called

  * this fixes a crash when going down
[SimlarService] handleTerminate abort when already going down
[SimlarServiceCommunicator] skips sending SimlarServiceBroadcast if not bound to service
[LinphoneThread] now clears handlers when finishing
[AndroidManifest] CodeCleanup: reordered
[CallActivity] removed FLAG_DISMISS_KEYGUARD
[AndroidManifext] ensure that SimlarService is available only to simlar app
[CreateAccountActivity] increased sms recieving priority in order to by pass text secure
Merge pull request #103 from simlar/going-down-and-othe-fixes-pullrequest

Going down and other fixes pullrequest