Merge branch 'factor_out_keyagreement_ui-theme' into 'master'

briar-android/src/main/AndroidManifest.xml

...riarproject/briar/android/activity/ActivityComponent.java

...iarproject/briar/android/contact/ContactListFragment.java

...g/briarproject/briar/android/keyagreement/CameraView.java

...t/briar/android/keyagreement/ContactExchangeActivity.java

...ject/briar/android/keyagreement/KeyAgreementActivity.java

...ject/briar/android/keyagreement/KeyAgreementFragment.java

.../java/org/briarproject/briar/android/view/QrCodeView.java

...oid/src/main/res/layout-land/fragment_keyagreement_qr.xml

...-android/src/main/res/layout/fragment_keyagreement_qr.xml

briar-android/src/main/res/layout/qr_code_view.xml