Rename "Authenticator Pro" to "Stratum" when importing from other apps

[coreystone]

Authenticator Pro has been renamed to "Stratum". This can be seen on the Play Store and the package name also reflects this change as well: com.stratumauth.app

When scrolling through the list of apps to import from, new Stratum users might not be familiar with the name change. I suggest renaming the app within the list or at least acknowledging both with something like: Stratum (Auth Pro).

In app/src/main/java/com/beemdevelopment/aegis/importers/AuthenticatorProImporter.java:

public class AuthenticatorProImporter extends DatabaseImporter {
    private static final String HEADER = "AUTHENTICATORPRO";
    private static final String HEADER_LEGACY = "AuthenticatorPro";
    private static final String PKG_NAME = "me.jmh.authenticatorpro";