CallFragment: add MVP model

Refactor CallFragment by adding MVP model, moving video management from
RingApplication to HardwareServiceImpl and removing use of
VideoCallbackManager

Change-Id: Ie75a0d33fa138590911d19d113df362ade29b9f4
Reviewed-by: Alexandre Lision <alexandre.lision@savoirfairelinux.com>
Tuleap: #1360
diff --git a/ring-android/app/src/main/res/values/strings_call.xml b/ring-android/app/src/main/res/values/strings_call.xml
index b591eb0..e16a75a 100644
--- a/ring-android/app/src/main/res/values/strings_call.xml
+++ b/ring-android/app/src/main/res/values/strings_call.xml
@@ -22,9 +22,9 @@
 -->
 <resources>
     <!-- SipCalls -->
-    <string name="call_human_state_incoming">Ringing</string>
+    <string name="call_human_state_incoming">Incoming</string>
     <string name="call_human_state_connecting">Connecting</string>
-    <string name="call_human_state_ringing">Calling</string>
+    <string name="call_human_state_ringing">Ringing</string>
     <string name="call_human_state_current">Talking</string>
     <string name="call_human_state_hungup">Over</string>
     <string name="call_human_state_busy">Busy</string>