improved calls/messages/contacts implemtation

used vector image assets

app/src/main/kotlin/com/tutpro/baresip/CallHistory.kt

@@ -0,0 +1,39 @@
+package com.tutpro.baresip
+
+import java.io.Serializable
+import java.util.GregorianCalendar
+
+class CallHistory(val aor: String, val peerURI: String, val direction: String,
+              val connected: Boolean) : Serializable {
+
+    val time: GregorianCalendar = GregorianCalendar()
+
+    companion object {
+
+        fun aorHistory(history: ArrayList<CallHistory>, aor: String): Int {
+            var size = 0;
+            for (h in history) {
+                if (h.aor == aor) size++
+            }
+            return size
+        }
+
+        fun aorRemoveHistory(history: ArrayList<CallHistory>, aor: String) {
+            for (h in history) {
+                if (h.aor == aor) {
+                    history.remove(h)
+                    return
+                }
+            }
+        }
+
+        fun aorLatestHistory(history: ArrayList<CallHistory>, aor: String): CallHistory? {
+            for (h in history.reversed())
+                if (h.aor == aor) return h
+            return null
+        }
+
+    }
+
+
+}