Add support for recycle bin for messages

This adds support for moving messages to recycle bin instead of
deleting them right away. The feature is not active by default.

This closes #451

app/src/main/kotlin/com/simplemobiletools/smsmessenger/extensions/Context.kt

@@ -641,6 +641,36 @@ fun Context.deleteConversation(threadId: Long) {
     messagesDB.deleteThreadMessages(threadId)
 }
 
+fun Context.checkAndDeleteOldRecycleBinMessages(callback: (() -> Unit)? = null) {
+    if (config.useRecycleBin && config.lastRecycleBinCheck < System.currentTimeMillis() - DAY_SECONDS * 1000) {
+        config.lastRecycleBinCheck = System.currentTimeMillis()
+        ensureBackgroundThread {
+            try {
+                for (message in messagesDB.getOldRecycleBinMessages(System.currentTimeMillis() - MONTH_SECONDS * 1000L)) {
+                    deleteMessage(message.id, message.isMMS)
+                }
+                callback?.invoke()
+            } catch (e: Exception) {
+            }
+        }
+    }
+}
+
+fun Context.emptyMessagesRecycleBin() {
+    val messages = messagesDB.getAllRecycleBinMessages()
+    for (message in messages) {
+        deleteMessage(message.id, message.isMMS)
+    }
+}
+
+fun Context.moveMessageToRecycleBin(id: Long) {
+    try {
+        messagesDB.insertRecycleBinEntry(RecycleBinMessage(id, System.currentTimeMillis()))
+    } catch (e: Exception) {
+        showErrorToast(e)
+    }
+}
+
 fun Context.deleteMessage(id: Long, isMMS: Boolean) {
     val uri = if (isMMS) Mms.CONTENT_URI else Sms.CONTENT_URI
     val selection = "${Sms._ID} = ?"