Make compatible with F-Droid (#42)

* Make compatible with F-Droid
* Fix title bar empty

mobile/src/fdroid/java/be/mygod/vpnhotspot/EBegFragment.kt

@@ -0,0 +1,27 @@
+package be.mygod.vpnhotspot
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.view.ViewStub
+import android.widget.Button
+import android.widget.LinearLayout
+import androidx.core.net.toUri
+import androidx.fragment.app.DialogFragment
+
+/**
+ * Based on: https://github.com/PrivacyApps/donations/blob/747d36a18433c7e9329691054122a8ad337a62d2/Donations/src/main/java/org/sufficientlysecure/donations/DonationsFragment.java
+ */
+class EBegFragment : DialogFragment() {
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View =
+            inflater.inflate(R.layout.fragment_ebeg, container, false)
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<LinearLayout>(R.id.donations__google).visibility = View.GONE
+        (view.findViewById<ViewStub>(R.id.donations__more_stub).inflate() as Button).setOnClickListener {
+            (activity as MainActivity).launchUrl("https://mygod.be/donate/".toUri())
+        }
+    }
+}

mobile/src/fdroid/java/be/mygod/vpnhotspot/Timber.kt

@@ -0,0 +1,7 @@
+package be.mygod.vpnhotspot
+
+import timber.log.Timber
+
+fun initTimber() = Timber.plant(Timber.DebugTree())
+
+fun debugLog(tag: String?, message: String?) = Timber.d(tag, message)