Fix F-droid build

foss/src/main/java/dev/lucasnlm/external/ExternalAnalyticsWrapper.kt

@@ -0,0 +1,15 @@
+package dev.lucasnlm.external
+
+import android.content.Context
+
+class ExternalAnalyticsWrapper(
+    context: Context
+) : IExternalAnalyticsWrapper {
+    override fun setup(context: Context, properties: Map<String, String>) {
+        // F-droid build doesn't have analytics.
+    }
+
+    override fun sendEvent(name: String, content: Map<String, String>) {
+        // F-droid build doesn't have analytics.
+    }
+}

foss/src/main/java/dev/lucasnlm/external/InstantAppManager.kt

@@ -0,0 +1,13 @@
+package dev.lucasnlm.external
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+
+class InstantAppManager : IInstantAppManager {
+    override fun isInstantAppSupported(context: Context): Boolean = false
+
+    override fun isInAppPaymentsSupported(context: Context): Boolean = false
+
+    override fun showInstallPrompt(activity: Activity, intent: Intent?, requestCode: Int, referrer: String?): Boolean = false
+}

foss/src/main/java/dev/lucasnlm/external/PlayGamesManager.kt

@@ -0,0 +1,31 @@
+package dev.lucasnlm.external
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+
+class PlayGamesManager(
+    context: Context
+) : IPlayGamesManager {
+    override fun hasGooglePlayGames(): Boolean = false
+
+    override fun silentLogin(activity: Activity) {
+        // F-droid build doesn't have Google Play Games
+    }
+
+    override fun getLoginIntent(): Intent? = null
+
+    override fun handleLoginResult(data: Intent?) {
+        // F-droid build doesn't have Google Play Games
+    }
+
+    override fun isLogged(): Boolean = false
+
+    override fun openAchievements(activity: Activity) {
+        // F-droid build doesn't have Google Play Games
+    }
+
+    override fun openLeaderboards(activity: Activity) {
+        // F-droid build doesn't have Google Play Games
+    }
+}