use installreferrer libray instead of broadcast listener

build.gradle

src/conversations/AndroidManifest.xml

.../siacs/conversations/services/InstallReferrerService.java

...s/java/eu/siacs/conversations/ui/MagicCreateActivity.java

...tions/java/eu/siacs/conversations/ui/WelcomeActivity.java

...ations/java/eu/siacs/conversations/utils/SignupUtils.java

...va/eu/siacs/conversations/utils/InstallReferrerUtils.java

...va/eu/siacs/conversations/utils/InstallReferrerUtils.java