* switch to composer for qrcode and otp dependencies

* move most OTP-related stuff into userhelper
* remove old phpqrcode and otphp libraries

vendor/spomky-labs/otphp/.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,21 @@
+| Q             | A
+| ------------- | ---
+| Branch?       | master
+| Bug fix?      | yes/no
+| New feature?  | yes/no
+| BC breaks?    | yes/no
+| Deprecations? | yes/no
+| Tests pass?   | yes/no
+| Fixed tickets | #... <!-- #-prefixed issue number(s), if any -->
+| License       | MIT
+| Tests added   |  <!--highly recommended for new features-->
+| Doc PR        |  <!--highly recommended for new features-->
+
+<!--
+Fill in this template according to the PR you're about to submit.
+Replace this comment by a description of what your PR is solving.
+
+Please consider the following requirement:
+* Modification of existing tests should be avoided unless deemed necessary.
+* You MUST never open a PR related to a security issue. Contact Spomky in private at https://gitter.im/Spomky/
+-->