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

build.gradle

@@ -6,7 +6,7 @@ buildscript {
     ext {
         kotlinVersion = '1.3.20'
         lifecycleVersion = '2.0.0'
-        roomVersion = '2.0.0'
+        roomVersion = '2.1.0-alpha03'
     }
     repositories {
         google()