[android] Combine Password and OpenDatabase Activity into StartupActivity

briar-android/src/main/AndroidManifest.xml

...ain/java/org/briarproject/briar/android/BriarService.java

...riarproject/briar/android/account/AuthorNameFragment.java

.../org/briarproject/briar/android/account/DozeFragment.java

...java/org/briarproject/briar/android/account/DozeView.java

...va/org/briarproject/briar/android/account/HuaweiView.java

...ava/org/briarproject/briar/android/account/PowerView.java

...iarproject/briar/android/account/SetPasswordFragment.java

...org/briarproject/briar/android/account/SetupActivity.java

...g/briarproject/briar/android/account/SetupController.java

...iarproject/briar/android/account/SetupControllerImpl.java

...org/briarproject/briar/android/account/SetupFragment.java

...rg/briarproject/briar/android/account/UnlockActivity.java

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

...g/briarproject/briar/android/activity/ActivityModule.java

...rg/briarproject/briar/android/activity/BriarActivity.java

...project/briar/android/controller/BriarControllerImpl.java

...arproject/briar/android/login/ChangePasswordActivity.java

...project/briar/android/login/ChangePasswordController.java

...ect/briar/android/login/ChangePasswordControllerImpl.java