Use a feature flag to hide connect via Bluetooth option

bramble-api/src/main/java/org/briarproject/bramble/api/FeatureFlags.java

@@ -10,4 +10,6 @@ public interface FeatureFlags {
 	boolean shouldEnableProfilePictures();
 
 	boolean shouldEnableDisappearingMessages();
+
+	boolean shouldEnableConnectViewBluetooth();
 }

bramble-core/src/test/java/org/briarproject/bramble/test/BrambleCoreIntegrationTestModule.java

@@ -38,6 +38,11 @@ public class BrambleCoreIntegrationTestModule {
 			public boolean shouldEnableDisappearingMessages() {
 				return true;
 			}
+
+			@Override
+			public boolean shouldEnableConnectViewBluetooth() {
+				return true;
+			}
 		};
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/AppModule.java

@@ -298,6 +298,11 @@ public class AppModule {
 			public boolean shouldEnableDisappearingMessages() {
 				return IS_DEBUG_BUILD;
 			}
+
+			@Override
+			public boolean shouldEnableConnectViewBluetooth() {
+				return IS_DEBUG_BUILD;
+			}
 		};
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java

@@ -371,6 +371,9 @@ public class ConversationActivity extends BriarActivity
 						this::showIntroductionOnboarding);
 			}
 		});
+		if (!featureFlags.shouldEnableConnectViewBluetooth()) {
+			menu.findItem(R.id.action_connect_via_bluetooth).setVisible(false);
+		}
 		// enable alias and bluetooth action once available
 		observeOnce(viewModel.getContactItem(), this, contact -> {
 			menu.findItem(R.id.action_set_alias).setEnabled(true);

briar-headless/src/main/java/org/briarproject/briar/headless/HeadlessModule.kt

@@ -94,5 +94,6 @@ internal class HeadlessModule(private val appDir: File) {
         override fun shouldEnableImageAttachments() = false
         override fun shouldEnableProfilePictures() = false
         override fun shouldEnableDisappearingMessages() = false
+        override fun shouldEnableConnectViewBluetooth() = false
     }
 }

briar-headless/src/test/java/org/briarproject/briar/headless/HeadlessTestModule.kt

@@ -82,6 +82,7 @@ internal class HeadlessTestModule(private val appDir: File) {
         override fun shouldEnableImageAttachments() = false
         override fun shouldEnableProfilePictures() = false
         override fun shouldEnableDisappearingMessages() = false
+        override fun shouldEnableConnectViewBluetooth() = false
     }
 
     @Provides