[VolumesControlActivity] Code Cleanup: turned gui elements into members

  * This is part of issue #23.
[VolumesControlActivity] added check box for software echo limiter

  * This is closes issue #23.
[VerifyNumberActivity] hack to show soft input if no telephone number is found on sim card
[VerifyNumberActivity] Code Cleanup XML: named layout

  * This part of issue #92.
[VerifyNumberActivity] now disables registration button if telephone number is empty

  * This is part of issue #92.
[VerifyNumberActivity] now the users needs to accept the privacy statement and the terms of use

  * This is part of issue #92.
[VerifyNumberActivity] now checks plausibility of entered number and corrects this number using libphonenumber
[CreateAccountActivity] SmsReceiver is registered at creation and destruction now (Dennis, Ben)
[SimlarService] take care of mLinphoneThread being null

  * This is part of issue #91.
[SimlarService] disabled logging of telephonebook

  * This is part of issue #97.
Merge pull request #100 from simlar/privacy-statement-and-echo-limitter-pullrequest

Privacy statement and echo limitter pullrequest