Integrate Should I Answer? blocking support (#977)

* Pulled over SIA code from 2.7.3

* Eliminate unnecessary service, fix service binding

* Flatten logic in isBlocked

* Return single which emits shouldBlock state

* Mark conversation as blocked during sync

data/src/main/java/util/Utils.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2017 Moez Bhatti <moez.bhatti@gmail.com>
+ *
+ * This file is part of QKSMS.
+ *
+ * QKSMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QKSMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QKSMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package util
+
+fun <T> tryOrNull(body: () -> T?): T? {
+    return try {
+        body()
+    } catch (e: Exception) {
+        null
+    }
+}