LANnouncer

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Fixes a few bug fixes, removes outdated features to comply with new security requirements.

1. Restores Android 5 (Lollipop) support. With fewer crashes.
2. Removes SMS action triggering.
3. GCM is the only external protocol now. WAN removed for reliability and security.

Local IP access is still enabled, so you can control LANNouncer within your network still.