Implement MAC lookup (#68)

* Implement MAC lookup

* Refine error processing

* Use long to store MAC consistently

* Link back to macvendors.co

* Undo some havoc

* Do not show mac spans for TV

* Show MAC and IP in a consistent order

* Add IP spans by ipinfo.io

* Add SpanFormatter

* Fix IPv6 ipinfo.io link

* Refine SpanFormatter

* Fix pressing the link

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

@@ -7,8 +7,8 @@ import android.view.ViewGroup
 import android.view.ViewStub
 import android.widget.Button
 import android.widget.LinearLayout
-import androidx.core.net.toUri
 import androidx.appcompat.app.AppCompatDialogFragment
+import be.mygod.vpnhotspot.util.launchUrl
 
 /**
  * Based on: https://github.com/PrivacyApps/donations/blob/747d36a18433c7e9329691054122a8ad337a62d2/Donations/src/main/java/org/sufficientlysecure/donations/DonationsFragment.java
@@ -21,7 +21,7 @@ class EBegFragment : AppCompatDialogFragment() {
         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())
+            requireContext().launchUrl("https://mygod.be/donate/")
         }
     }
 }